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Alex_M

[Photo] Converting 16-bit ProPhoto document to 8-bit sRGB changes colors

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I've got a 16-bit ProPhoto document that I want to convert to to 8-bit sRGB. However, when I do this the image changes colors. Why is that? I thought that only Assign ICC Profile changed color. Isn't Convert ICC Profile supposed to keep colors unchanged?

Please see attached. Notice the reddish tint of the on with the converted color profile.

converted_to_srgb.jpg

prophoto.jpg


Affinity Photo 1.6.5.123 for Windows Windows 10 x64 1803  CPU AMD Threadripper 1950X @3.9 Ghz  RAM 32 GB GPU GTX 1080 ti 11GB NVMe SSD Samsung 960 Pro 512 GB

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Well that operation changes gamuts (color spaces), from a very color rich wide gamut like ProPhoto to a much smaller one like sRGB with lesser available colors. There are a lot of colors in ProPhoto which don't have a 1:1 association in sRGB, thus colors can change during this transformation/conversion.

gamut_comparison.thumb.png.7581729611ff40fff91197f7f609611e.png


☛ Affinity Designer 1.7.0 ◆ Affinity Photo 1.7.0 ◆ OSX El Capitan

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Oh, I see. Thanks for the clarification! I'll just do some manual retouching until they match then. :)


Affinity Photo 1.6.5.123 for Windows Windows 10 x64 1803  CPU AMD Threadripper 1950X @3.9 Ghz  RAM 32 GB GPU GTX 1080 ti 11GB NVMe SSD Samsung 960 Pro 512 GB

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