AdobeRGB Files Printed on an sRGB Lab Workflow
A photographer edits 120 raw files from a Bharatanatyam performance on a six-year-old consumer IPS laptop. The monitor was calibrated two years ago with a hardware calibrator to D65, gamma 2.2 and 120 cd/m². Files are processed in 16-bit AdobeRGB and exported as JPEG quality 90 with the AdobeRGB profile embedded. The client’s lab prints on a Fuji Frontier using an sRGB workflow. The returned prints are too dark, with saturated reds and blocked shadows; the lab says the files are “not sRGB”. The client also views the same JPEGs on a phone and says the red costume looks orange. One lab print looks correct on the lab’s monitor but dark on the studio laptop.
1. Diagnose why the prints are dark and the reds saturated, and interpret the print that looks correct in the lab but dark in the studio.
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There are two separate issues. The first is profile handling. The files are in AdobeRGB, but the lab’s Frontier workflow expects sRGB. If the lab ignores the embedded profile and treats the AdobeRGB numbers as sRGB, saturated reds outside the sRGB gamut are pushed to the edge and clip, and the overall tone can shift. If the lab does convert but uses a different rendering intent or black-point setting, shadows can block. The phrase “not sRGB” is a warning that the lab is not managing the profile correctly.
The second issue is the studio monitor. A six-year-old consumer IPS panel calibrated two years ago may have drifted in brightness and colour. The print that looks correct on the lab’s monitor but dark on the studio laptop suggests the file is not necessarily dark; the studio display may be too bright or have a lifted black level. The phone complaint is separate again: phones often ignore the embedded profile and display AdobeRGB numbers as if they were sRGB, so the red costume shifts towards orange. I would not judge the file from the phone.
2. Specify the correct export and soft-proofing workflow for the album files.
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I would keep the master files in 16-bit AdobeRGB while editing, then convert - not assign - to sRGB for the lab. Converting changes the numbers to preserve the appearance; assigning sRGB would simply relabel the AdobeRGB numbers and create a colour shift. I would use relative colorimetric with black point compensation for most photographs, or perceptual if the reds and shadows show heavy gamut clipping, and check the gamut warning before conversion. Any saturated red fabric that clips would be brought back slightly before conversion rather than after.
Before exporting, I would soft-proof against the lab’s ICC profile if one is available, adjust midtones and black point, and make one test print of a representative image. The final JPEGs would be 8-bit sRGB with the sRGB profile embedded, at quality high enough to avoid blocking, and output sharpening applied at the final size. I would also keep a proof print and a note of the lab profile and rendering intent. The phone should not be used as the approval device.
3. Advise on calibration and communication with the lab and client before the album deadline.
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I would recalibrate the laptop monitor before making further colour judgements, then verify it against a known print under a controlled viewing light, ideally around 5000 K. If the monitor cannot be brought close to the lab print, I would rely on the lab’s soft proof and a physical proof rather than on the screen. A two-year-old calibration is not reliable for critical colour, and a consumer panel may not reach 120 cd/m² consistently. I would also ask the lab for its exact printer profile and whether it converts or assumes sRGB.
For the client, I would explain that phone screens and uncalibrated laptops are not colour references, and that approval will be based on a lab proof. With a Friday deadline, I would send one or two test files in sRGB, have them printed, compare the proof under the correct light, and only then export the album set. If the lab cannot supply a profile or proof, I would use a different lab or accept a limited colour guarantee in writing. The aim is a predictable print, not a perfect match to the phone.