Adobe Certified Professional Photoshop common mistakes
Adobe Certified Professional Photoshop · Understand the traps and how to avoid them.
Applying an adjustment through Image > Adjustments instead of adding an adjustment layer, then discovering the edit cannot be revisited or masked later.
The menu path is the fastest and most obvious route, so candidates use it under time pressure without considering editability.
What to do instead
Default to Layer > New Adjustment Layer (or the Adjustments panel) for any tonal or color change; reserve destructive Image > Adjustments for throwaway single-layer work.
Painting on the image layer with the Brush tool while intending to refine a mask, then wondering why the pixels are destroyed.
The mask thumbnail is small and easy to lose track of; the layer thumbnail stays targeted after other actions.
What to do instead
Before painting, click the mask thumbnail so it shows the white corner border, and confirm the foreground/background colors are black and white.
Making a selection with the wrong tool active and accidentally moving or duplicating pixels when the intent was to adjust the selection itself.
Selection tools share shortcuts and modifier keys, and a stray drag with the Move tool active shifts content instead of the marching ants.
What to do instead
Verify the active tool in the Options bar and use Selection tool modes (New, Add, Subtract, Intersect) plus Shift/Alt modifiers deliberately; use Select > Transform Selection to reshape rather than redraw.
Rasterizing or flattening smart objects early to 'make things simpler', losing the ability to reopen the source or apply non-destructive filters.
Some operations are greyed out until rasterization, so candidates take the shortcut without weighing the loss of flexibility.
What to do instead
Keep Smart Objects intact; use Smart Filters and double-click the smart object thumbnail to edit the source, and only rasterize on a duplicate when a specific filter truly requires it.
Exporting at screen resolution or with the wrong color profile for print, resulting in a low-resolution or color-shifted deliverable.
Candidates focus on the visual result on screen and skip Image Size and Convert to Profile before saving.
What to do instead
Check Image > Image Size for the target ppi (typically 300 for print), use Image > Mode and Edit > Convert to Profile for CMYK/print profiles, and choose the correct format (PDF/TIFF for print, JPEG/PNG for web).
Saving a layered working file as JPEG and losing all layers, masks, and adjustment layers.
JPEG is the most familiar format, and the Save As dialog defaults to whatever was last used.
What to do instead
Save the master as PSD or TIFF with layers preserved, then use File > Export As or Save a Copy for flattened distribution formats.
Confusing layer opacity with fill or with mask density, so the intended transparency change does not behave as expected.
Both sliders live in the same panel and look similar, but Fill ignores layer effects while Opacity does not.
What to do instead
Use Opacity when effects should fade with the layer, Fill when effects should stay at full strength, and adjust mask density/feather for masked transparency.
Using the Clone Stamp or Healing Brush on an empty layer or with 'Sample: Current Layer' set, so nothing visible happens.
The sampling source setting is buried in the Options bar and defaults vary by tool and session.
What to do instead
Set the sample source to 'All Layers' or 'Current & Below' and work on a separate retouching layer above the image, checking the Options bar before the first stroke.
Leaving the document in 8-bit or the wrong working space while performing heavy color grading, causing banding or unexpected color shifts.
Bit depth and color settings are set at document creation and rarely revisited during editing.
What to do instead
Use Image > Mode to confirm 16-bit for gradient-heavy work, and set Edit > Color Settings and Assign/Convert to Profile consistently before grading.
Losing the active selection or mask context by clicking elsewhere, then applying an edit to the whole canvas instead of the intended region.
Selections are transient and disappear on a stray click with a selection tool; the marching ants are easy to miss on busy images.
What to do instead
Save important selections via Select > Save Selection (or as a layer mask) before switching tools, and glance at the canvas for marching ants before committing an adjustment.