I85PREP
⌘ K
IAI CFPH study materials
IAI CFPH study resources

IAI CFPH practice questions

One question at a time. Build your IAI CFPH understanding.

First 50 of 200 questions. Each one lists the choices, the correct answer, and an explanation. The checker at the top of this page saves progress in this browser when it is available.

Continue in the practice tool above to load more questions, 50 at a time.

Question 1Forensic Photography & Imaging

In a 35 mm full-frame camera, which focal length gives approximately the same diagonal field of view as the human eye and is therefore often used for general scene documentation at crime scenes?

  1. 14 mm
  2. 50 mm Correct answer.
  3. 200 mm
  4. 400 mm

Explanation

A 50 mm lens on a full-frame sensor gives roughly a 46-degree diagonal field of view, close to natural human perception, which makes it a standard choice for undistorted overall scene documentation. Wide and long lenses introduce perspective exaggeration or compression that misrepresents spatial relationships.

Question 2Forensic Photography & Imaging

Which exposure control directly changes the camera sensor's sensitivity to light and is typically raised at a dim scene at the cost of increased image noise?

  1. Shutter speed
  2. Aperture
  3. ISO setting Correct answer.
  4. White balance

Explanation

The ISO setting governs the amplification applied to the sensor signal, so raising it brightens a dim scene but also amplifies noise. Shutter speed and aperture control the amount of light reaching the sensor, while white balance only adjusts color rendering.

Question 3Forensic Photography & Imaging

Why is it standard practice to place a scale or ruler in medium and close-up evidence photographs?

  1. To provide a reference for size and to allow later measurement of the item Correct answer.
  2. To indicate the case number and the photographer's identity
  3. To record the date and time of the exposure
  4. To calibrate the camera's white balance at the scene

Explanation

A scale placed in the same plane as the evidence gives a known reference so that dimensions can be established or verified later. It does not carry case metadata, color calibration, or time information, which are handled by labels, gray cards, and camera records.

Question 4Forensic Photography & Imaging

Which lighting arrangement is best suited to reveal the surface texture of a tool mark on a flat metal plate?

  1. Diffuse light from a softbox directly overhead
  2. Oblique or raking light from a low angle Correct answer.
  3. Backlighting from behind the plate
  4. Direct on-axis flash from the lens

Explanation

Raking light skims across the surface and casts small shadows in the striations, making fine texture visible. On-axis flash flattens detail, overhead diffusion reduces shadow contrast, and backlighting silhouettes the object rather than revealing surface relief.

Question 5Forensic Photography & Imaging

A photographer needs to document a shoe impression in loose sand and wants maximum sharpness from front to back. Which approach is most appropriate?

  1. Use a small aperture and focus-stack or use a wide-angle lens close to the ground Correct answer.
  2. Use a long telephoto lens from a distance to compress the impression
  3. Open the aperture fully to blur the background
  4. Increase ISO to the maximum and hand-hold at a fast shutter

Explanation

Depth of field increases with a smaller aperture, and in loose sand the impression has three-dimensional relief that benefits from front-to-back sharpness. Focus stacking or a wide lens close to the ground maximizes the documented detail without perspective distortion.

Question 6Forensic Photography & Imaging

In what orientation should a firearm be photographed for the primary overall evidence image, according to standard forensic documentation practice?

  1. At a 45-degree angle so the barrel is foreshortened
  2. With the muzzle pointing toward the top or side of the frame and the full weapon visible Correct answer.
  3. With the muzzle pointing directly at the camera
  4. Upside down to show the serial number first

Explanation

Photographing the firearm with its full profile visible and the muzzle oriented consistently (toward the top or side) preserves the shape and prevents foreshortening. Muzzle-on or angled views distort proportions and can obscure identifying features.

Question 7Forensic Photography & Imaging

Which file format is generally preferred for archival storage of forensic images because it does not apply lossy compression?

  1. TIFF Correct answer.
  2. MPEG-4
  3. GIF
  4. JPEG

Explanation

TIFF stores image data without lossy compression, so it preserves detail for later analysis and archiving. JPEG uses lossy compression that discards data, while MPEG-4 and GIF are formats intended for video or limited-color graphics.

Question 8Forensic Photography & Imaging

Why should the original image file be preserved unaltered and any enhancement performed on a working copy?

  1. To speed up the processing of the images
  2. To maintain the chain of custody and allow verification of the original Correct answer.
  3. To reduce the storage space required for the case
  4. To comply with the camera manufacturer's warranty

Explanation

Preserving the unaltered original maintains the chain of custody and lets a reviewer verify that any enhancement was not fabricated. Working on a copy ensures the evidentiary record remains intact.

Question 9Forensic Photography & Imaging

A photograph of a latent fingerprint on a curved glass surface shows a bright specular reflection obscuring the ridge detail. What is the most effective corrective step?

  1. Increase the shutter speed to freeze the reflection
  2. Switch to a higher ISO to overpower the reflection
  3. Reposition the light source to change the angle of reflection away from the lens Correct answer.
  4. Zoom in with the lens to crop out the reflection

Explanation

Specular reflection follows the angle of incidence, so moving the light changes where the glare appears. Repositioning the light removes the reflection from the lens's line of sight while preserving ridge detail.

Question 10Forensic Photography & Imaging

Which practice best ensures that a series of overall, midrange, and close-up photographs can be related to one another later?

  1. Using a different lens for every photograph
  2. Deleting images that look similar to save space
  3. Photographing each item in a separate session
  4. Capturing identifiable reference points in each frame and logging each shot Correct answer.

Explanation

Including recognizable reference points and maintaining a photo log lets a reviewer link overview, midrange, and close-up images to the same location and item. Consistent documentation is what establishes the relationship between frames.

Question 11Forensic Photography & Imaging

What is the primary purpose of a photographic log or photo identifier sheet used at a scene?

  1. To certify the photographer's training credentials
  2. To replace the need for a scale in close-up images
  3. To record each exposure, its subject, and its location for later reference Correct answer.
  4. To measure the ambient light level at the scene

Explanation

A photo log records what each frame depicts, where it was taken, and in what sequence, providing the narrative that ties images to the scene. It supplements rather than replaces scales and does not certify credentials or measure light.

Question 12Forensic Photography & Imaging

A photographer uses a 100 mm macro lens at 1:1 magnification to record a cartridge case. Which factor most limits the depth of field in this setup?

  1. The very short working distance and high magnification Correct answer.
  2. The color temperature of the light source
  3. The file format selected for capture
  4. The large sensor size of the camera

Explanation

At 1:1 magnification the effective aperture and working distance are small, so depth of field becomes very shallow. Sensor size, color temperature, and file format do not determine depth of field at high magnification.

Question 13Forensic Photography & Imaging

Which camera setting should be adjusted to eliminate motion blur when photographing a scene handheld in low light?

  1. A wider aperture combined with a slower shutter
  2. A custom white balance preset
  3. A faster shutter speed, supported by a higher ISO or added light Correct answer.
  4. A slower shutter speed to gather more light

Explanation

Motion blur is controlled by shortening the exposure time, which may require raising ISO or adding light to compensate. Slower shutter speeds increase blur, and white balance does not affect motion.

Question 14Forensic Photography & Imaging

When photographing a bloodstain pattern on a vertical wall, which camera orientation keeps the pattern's geometry true to the wall surface?

  1. Tilting the camera upward from below the pattern
  2. Holding the camera with the sensor plane parallel to the wall Correct answer.
  3. Using a fisheye lens close to the wall
  4. Shooting from an oblique angle to show depth

Explanation

Keeping the sensor plane parallel to the wall avoids perspective distortion, so the recorded geometry matches the actual pattern. Tilting or oblique angles introduce keystoning that misrepresents shape and spacing.

Question 15Forensic Photography & Imaging

Which technique is used to photograph a latent fingerprint developed with fluorescent powder in a darkened room?

  1. High-speed flash with a wide-open aperture
  2. Backlighting with a continuous tungsten lamp
  3. Excitation with an alternate light source and a barrier filter over the lens Correct answer.
  4. Direct white flash with no filtration

Explanation

Fluorescent powder emits light at a longer wavelength when excited, so an alternate light source plus a barrier filter that blocks the excitation wavelength isolates the glowing ridges. White flash or tungsten backlighting would wash out the fluorescence.

Question 16Forensic Photography & Imaging

What does the term 'chain of custody' require of digital forensic images?

  1. A documented record of every transfer and access to the image from capture onward Correct answer.
  2. That images be converted to JPEG before archiving
  3. That only one person ever views the image
  4. That images be stored on the original camera memory card indefinitely

Explanation

Chain of custody is the documented history of who handled or accessed the evidence and when, ensuring the image can be shown to be unaltered. It does not require single-person access, indefinite card storage, or lossy conversion.

Question 17Forensic Photography & Imaging

A photographer must document a large outdoor scene covering several hundred meters. Which approach best captures an overall view?

  1. Elevated vantage points or aerial photography combined with ground-level frames Correct answer.
  2. A telephoto shot of the farthest boundary
  3. A single close-up of the most important item
  4. A macro lens series of the ground surface

Explanation

Large scenes require elevated or aerial perspectives to show layout and relationships, supported by ground-level images for detail. Close-up or telephoto-only approaches fail to convey the overall spatial arrangement.

Question 18Forensic Photography & Imaging

Which factor most directly determines the resolution of fine detail captured by a digital camera sensor?

  1. The color of the camera body
  2. The size of the memory card
  3. The camera's battery capacity
  4. The number of pixels and the lens's resolving power Correct answer.

Explanation

Detail resolution depends on how many pixels sample the image and on the lens's ability to project fine detail onto them. Battery, storage, and body color have no bearing on optical resolution.

Question 19Forensic Photography & Imaging

Why is a gray card or color reference target included in some evidence photographs?

  1. To measure the physical dimensions of the evidence
  2. To allow accurate color balance and exposure reference during later processing Correct answer.
  3. To record the camera's serial number
  4. To indicate the direction of north at the scene

Explanation

A neutral gray card provides a known reference for setting white balance and exposure, so colors can be rendered accurately in later processing. It does not measure size, indicate direction, or record serial numbers.

Question 20Forensic Photography & Imaging

A photographer needs to record a bite mark on skin with accurate color and scale. Which combination is most appropriate?

  1. Available room light with a telephoto lens
  2. Direct on-axis flash with no scale
  3. Ultraviolet illumination with no filtration
  4. Cross-polarized flash with a scale and color reference in the same plane Correct answer.

Explanation

Cross-polarization reduces surface glare from skin so underlying color and pattern are recorded accurately, while a scale and color reference in the same plane provide measurement and color fidelity. Direct flash creates glare and omits references.

Question 21Forensic Photography & Imaging

What is the effect of using a polarizing filter when photographing evidence behind reflective glass?

  1. It increases the reflection to highlight the glass surface
  2. It converts the image to black and white
  3. It can reduce glare from the glass so the item behind is visible Correct answer.
  4. It changes the focal length of the lens

Explanation

A polarizing filter blocks light oscillating in certain planes, which can suppress reflections from non-metallic surfaces such as glass. It does not enhance reflections, alter focal length, or change color to monochrome.

Question 22Forensic Photography & Imaging

When is it appropriate to use a flash in a scene where flammable vapors may be present?

  1. Only when the scene has been declared safe by the responsible authority Correct answer.
  2. Only when the camera is set to manual mode
  3. Whenever a high ISO would add noise
  4. Whenever the photographer needs more light

Explanation

Electronic flash can produce a spark and ignite flammable vapors, so it must only be used once the scene is declared safe by the authority in charge. Photographic convenience or camera settings never override this safety requirement.

Question 23Forensic Photography & Imaging

Which practice helps prevent perspective distortion when photographing a footprint on the floor?

  1. Standing at the doorway and shooting at an angle
  2. Using a wide-angle lens from knee height
  3. Positioning the camera directly above the impression with the sensor parallel to the floor Correct answer.
  4. Tilting the camera down from standing height

Explanation

Placing the camera directly above the impression with the sensor parallel to the floor keeps the recorded shape true to the actual footprint. Angled or tilted views introduce foreshortening and keystoning.

Question 24Forensic Photography & Imaging

Which metadata embedded in a digital image file is most useful for establishing when and with what device a photograph was taken?

  1. XMP rating data
  2. ICC color profile
  3. IPTC caption data
  4. EXIF data Correct answer.

Explanation

EXIF records camera model, exposure settings, and date/time at capture, which supports authentication of when and how an image was made. IPTC and XMP carry descriptive or rating information added later, and ICC profiles describe color rendering.

Question 25Forensic Photography & Imaging

What is the recommended minimum content of an overall scene photograph taken before any item is moved?

  1. A photograph of the photographer's equipment
  2. A close-up of the most valuable item only
  3. A series of macro images of surface textures
  4. A wide view showing the scene layout and the positions of items in context Correct answer.

Explanation

The initial overall photograph captures the scene as found, showing the layout and relative positions of items before anything is disturbed. Close-ups and macro images are taken afterward to record detail.

Question 26Forensic Photography & Imaging

In forensic photography, what is the primary function of a scale (ABFO or L-shaped) placed adjacent to an item of evidence?

  1. To provide a known reference from which real dimensions can be derived from the image Correct answer.
  2. To calibrate the camera's white balance to the scene illuminant
  3. To indicate the direction of the camera's optical axis
  4. To block stray light from reaching the evidence surface

Explanation

A scale provides a known physical reference in the same plane as the evidence, allowing later measurement or verification of size from the photograph. It must lie in the plane of the subject to avoid scale error from perspective.

Question 27Forensic Photography & Imaging

A photographer is documenting a shoe impression in fine dry dust on a dark tile floor. Which lighting approach best reveals the impression without destroying it?

  1. Backlighting through the tile from beneath the surface
  2. Broad, even fill light from directly above the impression
  3. Direct on-camera flash at full power perpendicular to the floor
  4. Low-angle or oblique lighting raking across the surface from a position outside the impression Correct answer.

Explanation

Dust impressions are surface features revealed by shadow and texture, so light must strike at a low grazing angle to create contrast across the ridges and edges. The light source is kept outside the impression so the equipment does not contact or disturb the trace evidence.

Question 28Forensic Photography & Imaging

When photographing a document for forensic examination, which setup best minimizes geometric distortion of the text?

  1. A fisheye lens to capture the whole page in one frame
  2. A handheld shot from standing height with digital straightening applied later
  3. A wide-angle lens close to the page, angled slightly to avoid reflections
  4. A telephoto or macro lens on a copy stand with the sensor plane parallel to the document Correct answer.

Explanation

Keeping the image plane parallel to the document and using a longer focal length on a rigid copy stand minimizes keystone and barrel distortion, preserving accurate letter proportions. Perspective correction after capture cannot fully restore information lost to oblique geometry.

Question 29Forensic Photography & Imaging

What does the term 'depth of field' refer to in evidence close-up photography?

  1. The angle of view covered by the lens at its widest setting
  2. The range of subject distances that appear acceptably sharp in the final image Correct answer.
  3. The maximum brightness range the sensor can record without clipping
  4. The physical distance from the lens front to the image sensor

Explanation

Depth of field is the zone in front of and behind the focused plane within which detail is rendered acceptably sharp. In macro evidence work it becomes very shallow, so small apertures, careful focus placement, and often focus stacking are used.

Question 30Forensic Photography & Imaging

A forensic photographer must record a latent print on a dark, non-porous surface using a fluorescent dye stain. Which combination of camera and lighting conditions is most appropriate?

  1. Ambient room lighting with a standard hot-shoe flash and no filtration
  2. A darkened environment with an excitation light source and a barrier filter matched to the dye's emission Correct answer.
  3. Continuous tungsten work lights with the lens stopped down to f/22
  4. Infrared illumination with the camera's IR-cut filter removed

Explanation

Fluorescent dyes emit weakly at a longer wavelength than the excitation light, so the room must be darkened and a barrier filter must pass the emission while blocking reflected excitation. This maximizes signal-to-noise and prevents the excitation light from washing out the fluorescence.

Question 31Forensic Photography & Imaging

Which camera control directly changes the brightness of the captured image without altering the lens aperture or shutter speed?

  1. Focus ring
  2. Zoom ring
  3. ISO setting Correct answer.
  4. White balance preset

Explanation

ISO adjusts the sensor's effective sensitivity or the amplification applied to the signal, changing image brightness at a fixed aperture and shutter speed. Raising ISO also increases noise, so it is balanced against exposure time and depth of field needs.

Question 32Forensic Photography & Imaging

In forensic imaging, what is 'photogrammetry' most commonly used to accomplish?

  1. To derive three-dimensional measurements of a scene or object from overlapping photographs Correct answer.
  2. To synchronize multiple flashes to a single shutter release
  3. To remove noise from a digital image using a median filter
  4. To convert a color image into a grayscale image for comparison

Explanation

Photogrammetry uses multiple overlapping images taken from different viewpoints to reconstruct geometry and derive measurements. It is valuable for documenting large or complex scenes where direct measurement is impractical or unsafe.

Question 33Forensic Photography & Imaging

A photographer must capture a weapon lying on a patterned bedspread. Which technique best separates the weapon from the busy background in the close-up image?

  1. Photograph from a greater distance with a wide-angle lens
  2. Use a smaller aperture to increase depth of field across the entire bed
  3. Increase the ISO to the maximum available setting
  4. Use a wider aperture to blur the background and isolate the subject Correct answer.

Explanation

A wider aperture narrows depth of field so the patterned background falls out of focus, visually separating the weapon while keeping the subject sharp. The photographer must still ensure the entire relevant surface of the weapon remains within the sharp zone.

Question 34Forensic Photography & Imaging

Which statement correctly describes the relationship between shutter speed and motion blur in forensic photography?

  1. Shutter speed controls color temperature rather than motion
  2. Shutter speed has no effect on blur when a flash is used
  3. Shorter shutter speeds reduce blur from subject or camera movement Correct answer.
  4. Longer shutter speeds always sharpen moving subjects

Explanation

A shorter exposure time limits how far a moving subject or a shaking camera travels while the shutter is open, reducing blur. Forensic photographers select shutter speed to freeze expected motion and often use a tripod or remote release for static evidence.

Question 35Forensic Photography & Imaging

A photographer is documenting a bloodstain pattern on a vertical wall and wants to show both the pattern and its position relative to the room. Which pair of images best achieves this?

  1. A single handheld wide-angle image from an oblique angle
  2. An overall orientation view including the wall and surroundings, followed by a scaled perpendicular close-up of the pattern Correct answer.
  3. Two identical close-ups taken with different white balance settings
  4. A macro image of one stain with no scale and no orientation view

Explanation

Forensic documentation pairs an orientation image that places the pattern in context with a close-up taken perpendicular to the surface with a scale in the same plane. The perpendicular close-up preserves pattern geometry and allows measurement.

Question 36Forensic Photography & Imaging

What is the main purpose of taking a 'midrange' photograph in the standard overall-midrange-close-up sequence?

  1. To show the item of evidence in relation to its immediate surroundings and nearby reference points Correct answer.
  2. To record the finest surface detail at maximum magnification
  3. To capture the entire scene from the farthest possible vantage point
  4. To document the photographer's identity and credentials

Explanation

The midrange image bridges the overall scene view and the close-up by showing the evidence item together with its immediate context, such as furniture or adjacent items. This helps a viewer move logically from the general scene to the specific detail.

Question 37Forensic Photography & Imaging

When photographing a reflective metallic object such as a knife blade, which technique best controls unwanted glare?

  1. Directing a bare flash straight at the blade from the camera position
  2. Photographing the blade against a white background with maximum flash power
  3. Increasing the ISO to compensate for the reflection
  4. Using a diffused or bounced light source and adjusting its angle relative to the camera Correct answer.

Explanation

On a specular surface the reflection angle equals the incidence angle, so moving a diffused source away from the camera's axis directs glare out of the lens. Diffusion also spreads the highlight, revealing surface detail rather than a blown-out hotspot.

Question 38Forensic Photography & Imaging

Which factor best explains why a forensic photographer records the camera-to-subject distance and lens focal length in the photo log?

  1. To allow later reconstruction of the camera position and perspective for analysis Correct answer.
  2. To certify that the camera's firmware is up to date
  3. To determine the battery life remaining in the camera
  4. To prove the photographer owned the equipment used

Explanation

Distance and focal length define the perspective and magnification of an image, which supports later reconstruction, comparison, or verification by another examiner. Recording them makes the documentation reproducible rather than merely descriptive.

Question 39Forensic Photography & Imaging

A photographer needs to capture a full-body view of a decedent at a scene while preserving accurate proportions. Which lens choice is generally preferred?

  1. A very wide-angle lens used close to the body
  2. A fisheye lens to include the entire room
  3. A macro lens at 1:1 magnification
  4. A normal to short telephoto lens used from a distance that fills the frame Correct answer.

Explanation

Normal to short telephoto focal lengths used from a moderate distance render body proportions naturally and avoid the exaggerated near-far effect of wide-angle lenses. Wide-angle close-ups stretch features closest to the lens and misrepresent anatomy.

Question 40Forensic Photography & Imaging

What is the primary reason for capturing images in a raw or uncompressed format rather than a lossy compressed format during evidence documentation?

  1. Raw files are always smaller and faster to transmit
  2. Lossy compression discards image data that may be needed for later analysis Correct answer.
  3. Lossy formats cannot be printed at any size
  4. Raw files automatically correct all exposure errors

Explanation

Lossy compression permanently discards image information, which can remove fine detail relevant to latent print, toolmark, or document examination. Raw or lossless formats preserve the full recorded data for later enhancement and review.

Question 41Forensic Photography & Imaging

A photographer uses a macro lens at high magnification to record a toolmark. Which practice best ensures the entire mark is sharp in a single image?

  1. Increase the camera-to-subject distance until the mark is tiny in the frame
  2. Stop down the aperture and, if needed, use focus stacking across the mark Correct answer.
  3. Use a slower shutter speed and hand-hold the camera
  4. Open the aperture to its widest setting to admit more light

Explanation

At high magnification depth of field becomes extremely shallow, so stopping down extends the sharp zone and focus stacking combines multiple focal planes when a single frame is insufficient. Both approaches preserve detail across the full mark.

Question 42Forensic Photography & Imaging

Which lighting geometry is used to reveal indented writing or surface texture on a document?

  1. Transmitted light through an opaque backing
  2. Oblique or raking light at a low angle to the document surface Correct answer.
  3. Diffuse dome lighting from all directions equally
  4. Axial lighting directed along the camera axis

Explanation

Raking light at a low angle casts small shadows along indentations and surface irregularities, making them visible. Axial or fully diffuse light tends to flatten these subtle features.

Question 43Forensic Photography & Imaging

In digital forensic imaging, what does a hash value computed on an image file provide?

  1. A record of the lens focal length used
  2. A way to enhance the contrast of the image
  3. A means to verify that the file has not changed since the hash was calculated Correct answer.
  4. A method to compress the file without data loss

Explanation

A cryptographic hash is a fixed-length digest derived from the file contents; any alteration produces a different digest. Comparing hashes therefore demonstrates integrity of the image file over time.

Question 44Forensic Photography & Imaging

A photographer must document a large outdoor scene at night where ambient light is very low. Which approach best balances exposure and evidence detail?

  1. Hand-hold the camera at maximum ISO and rely on digital brightening later
  2. Use only the camera's built-in flash from a distance of 50 meters
  3. Use a tripod with a long exposure and supplemental lighting, checking that lighting does not alter the evidence Correct answer.
  4. Increase shutter speed to 1/4000 second and accept an underexposed image

Explanation

A tripod with a controlled long exposure gathers enough light for a properly exposed, sharp image, and supplemental lighting can reveal detail when its placement does not disturb the scene. The photographer verifies that added light does not change the appearance of evidence.

Question 45Forensic Photography & Imaging

Which statement best describes the role of a color reference target in forensic photography?

  1. It provides a known color and neutral patch so color can be corrected or verified later Correct answer.
  2. It records the GPS coordinates of the camera
  3. It measures the physical dimensions of the evidence
  4. It synchronizes the flash with the shutter

Explanation

A color target contains patches of known values that allow later neutralization and color verification, which is important when color itself is evidentiary, such as in bruise or stain documentation. It complements rather than replaces a measurement scale.

Question 46Forensic Photography & Imaging

A photographer is asked to compare the height of two suspects from surveillance images. Which factor most affects the reliability of the comparison?

  1. The color temperature of the surveillance lighting
  2. The camera's position, lens focal length, and the subjects' distance from the camera Correct answer.
  3. The file format used to export the surveillance video
  4. The number of frames per second in the recording

Explanation

Height comparison from images depends on reconstructing the camera geometry, including position, focal length, and subject distance, because these determine perspective and scale. Without control of these variables, apparent height differences can be artifacts of perspective.

Question 47Forensic Photography & Imaging

When photographing a bite mark on skin, which practice best supports subsequent forensic comparison?

  1. Apply a strong color filter to emphasize the mark
  2. Photograph with a scale in the plane of the skin and light the area obliquely to show indentation Correct answer.
  3. Use direct flash from close range to maximize brightness
  4. Photograph only after the skin has healed completely

Explanation

A scale in the same plane as the skin permits accurate measurement, and oblique lighting reveals the three-dimensional indentation that may not be visible under flat illumination. Both are needed for meaningful comparison with a suspected dentition.

Question 48Forensic Photography & Imaging

What is the purpose of bracketing exposures when photographing a scene with high dynamic range?

  1. To capture multiple exposures so highlight and shadow detail can be combined or selected Correct answer.
  2. To synchronize multiple cameras to one shutter release
  3. To change the lens focal length between shots
  4. To reduce the file size of the final image

Explanation

Bracketing records the same view at different exposure levels, ensuring that detail in both bright and dark areas is captured in at least one frame. The frames can then be combined or the best exposure selected for the evidentiary record.

Question 49Forensic Photography & Imaging

Which practice best preserves the evidentiary value of a digital image when it must be enhanced for analysis?

  1. Delete the original once the enhanced image is accepted
  2. Convert the original to JPEG before any enhancement
  3. Retain the original file unaltered and document each enhancement step on a working copy Correct answer.
  4. Save the enhanced result over the original file to keep a single record

Explanation

The original file is the primary evidence and must remain unaltered, with enhancements performed on a copy and each processing step documented for transparency. This allows another examiner to reproduce the work and verify that no data was improperly changed.

Question 50Forensic Photography & Imaging

A photographer is documenting a footprint in snow. Which technique best preserves both the impression and a usable image?

  1. Use direct flash from directly above to maximize brightness
  2. Photograph only after the snow has melted and refrozen
  3. Photograph with oblique lighting and a scale before any casting or removal, using methods that avoid melting Correct answer.
  4. Pour warm water into the impression to clear the surface before photographing

Explanation

Snow impressions are fragile and heat-sensitive, so the image must be captured first with oblique lighting and a scale, using equipment and methods that do not introduce heat or melt. Casting or removal follows only after the photographic record is secured.