Hue blend mode alters saturation too!

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  • Updated 7 years ago
I have created a base image, with just stripes of pure red, green and blue, hsb 0,100,100 ; 120,100,100 ; 240, 100, 100.
I then added a color fill layer of pure blue, hsb 240, 100, 100.
When I set the blend mode to hue, I expected the whole image to turn blue, as I expected all the hues to go to 240 and the saturation and brighness to be unaffected, but I got saturations of 46 and 79 in the green and red areas respectively, giving a striped image.
Why was this? I thought the hue blend mode was supposed to affect hue only, and not affect saturation ???
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burgess taylor

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  • unsure

Posted 7 years ago

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christoph pfaffenbichler, Champion

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Does this also happen if you are working on an image in HSB-mode?

If you check the Color Picker you might see that the color’s L*a*b-L is not identical.
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burgess taylor

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I don't seem to have an HSB mode?

In lab mode the effect is different, but still not 'right' ?
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christoph pfaffenbichler, Champion

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There used to be a plug-in to allow creating HSB-documents.
http://www.adobe.com/support/download...

In L*a*b the a- and b-channels carry meaning to both Hue and Saturation, so setting the top Layer to Color instead if Hue would make them identical, I guess.