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[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

Aleksandar Mitov
www.renarvisuals.com CGI and 3D rendering services
email: office@renarvisuals.com

Affinity Photo 2.5.5  Windows 10 Pro x64 ver. 22H2  AMD Ryzen 9950X 16-core + 96 GB DDR5  GeForce RTX 3090 24GB + driver 565.90

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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

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

Aleksandar Mitov
www.renarvisuals.com CGI and 3D rendering services
email: office@renarvisuals.com

Affinity Photo 2.5.5  Windows 10 Pro x64 ver. 22H2  AMD Ryzen 9950X 16-core + 96 GB DDR5  GeForce RTX 3090 24GB + driver 565.90

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