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Found 1 result

  1. Expected behavior: In Affinity Photo, apply a scanner profile to a raw scan with no profile, then convert to a working space such as ROMM RGB. 1) Results should be very similar to doing the same steps in an external app (I don't expect that they'd be pixel-perfect, but any differences should not be perceptible). 2) There shouldn't be any visible color casts in the result. Actual behavior: Results are perceptibly different between Affinity Photo's result and argyllcms' cctiff. Given a scanned IT8/7.2 target with the profile applied and then converted to ROMM RGB (once in Affinity, and then once with cctiff on a copy of the image), for Affinity Photo the dark grey rectangles in the image have a reddish color cast to them, whereas the output of cctiff has those squares as a neutral grey. Repro steps: To generate the Affinity Photo output: Open the unprofiled image ("raw0010_2019-5-20-downsampled.tiff"). Document->Assign ICC Profile... then Assign the desired scanner profile ("2019-10-27_qh_as_u"). Document->Convert Format/ICC Profile... then Convert to the desired working space profile ("ProPhoto RGB"--see Note 1). Rendering Intent is Relative Colourimetric. Black Point Compensation is on (it also repros with BPC off... doesn't matter). Observe that the grey rectangles at the bottom of the image have a reddish color cast to some of them, #19-21 in particular. (The RGB values confirm that there's more red present.) To generate the cctiff output (can use GIMP instead--see Note 3): Install cctiff. I downloaded the source code, v2.1.1, at https://www.argyllcms.com/downloadsrc.html and compiled it on my Mac. Run cctiff like so: ~/Argyll_V2.1.1/imdi/cctiff -e ~/Argyll_V2.1.1/icc/ProPhoto.icm -ir /PATH/TO/2019-10-27_qh_as_u.icc -ir ~/Argyll_V2.1.1/icc/ProPhoto.icm /PATH/TO/raw0010_2019-5-20-downsampled.tiff /PATH/TO/2019-5-20-downsampled-output_of_cctiff.tiff Observe that the grey rectangles at the bottom of the image are all neutral grey. Notes: ProPhoto.icm (which displays as "ProPhoto RGB" in Affinity Photo) is argyll's included ProPhoto color profile (which I imported into Affinity's color profiles by just opening some existing file that already had that profile embedded). However, this still repros if I instead convert to the included ROMM RGB profile in Affinity. The scanner profile was generated by argyll separately (scanin and colprof). (I actually used this exact raw image to generate the profile.) I can also generate the expected output (i.e. no reddish color cast in the dark greys) with GIMP (it's using argyllcms under the hood). Just apply the scanner profile, then convert. I don't have Photoshop so I can't do this experiment there. I'm on Affinity Photo 1.8.3, but this repros on 1.7.x as well. I've also attached the output of Affinity Photo's Preferences->Color menu, just in case those settings matter. ProPhoto.icm 2019-10-27_qh_as_u.icc raw0010_2019-5-20-downsampled.tiff 2019-5-20-downsampled-output_of_affinity_photo.tiff 2019-5-20-downsampled-output_of_cctiff.tiff
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