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I have two fully saturated colours: yellow and ultramarine. If I reduce both their saturation to 0% I end up with two greys of the exactly the same tone.
But because yellow has a higher luminance than blue, shouldn't the yellow without any saturation be brighter than the blue?
[Moved from the Color management forum to a Photoshop forum - moderator]
You're right, but this is how the RGB model works. It just averages values.
Convert to Lab first, and you'll get the inherent luminance right.
Maybe try to use Black White - adjustments - this way you can adjust any colors and prepare perfect grayscale picture
Awesome! Thank you so much 😄
Or just use the Fade Command after using Saturation in RGB, pick a blend mode like Color or Saturation. Not exactly the same as converting to Lab but, no conversion to Lab which is something you don’t want to do with 8-bit per color data!