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Posted (edited)

Hello,

I'm confused about how the HSL adjustment actually works.  I get the basics.  I own several photo editing software and have used HSL adjustment before.  And Affinity's HSL adjustment works exactly as I expect it to when it's set on the Master Channel.  Moving the Luminosity Shift to -100% blackens the image.

The problem that I run into is that selecting any of the color swatches to narrow the effect, don't work like I expect.  Take for example this image : https://www.pexels.com/photo/orange-lighthouse-1660995/

If I highlight the blue swatch so that it selects hues 225-255 with fall-offs at 195 and 285 and I move the Luminosity shift I expect these colors to start moving toward black.  Instead they just get more greyscale.  The luminosity is barely touched.  It's a great effect but why does narrowing the targeted pixels by hue change the function of the luminosity slider so drastically?  It's not what I expected to happen at all.

Can anyone help me to understand how this works? 

Edited by LeviFiction
Posted

Thank you, that makes some sense.  But I'm still confused, while I can see and accept that it's not just selecting all pixels of a certain hue and is in fact working on RGB channels, why doesn't the blue channel go completely black at -100?  Instead they seem to be coming into line with the Red channel?

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