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Applying linear HSV gradients

Apr 22, 2012, 14:55
Post: #1
Applying linear HSV gradients
And for my next question :-)

See image below. I have the kind of bull/goat face in this edited out as a separate layer for adjusting, what I would like to do with it at the moment is apply a left to right brightness gradient on it to make it gradually change from light to dark so that it blends in with the background a bit better.

I'm sure there is an easy way to do this, but I just can't see it.

[Image: QpGaQ.jpg]
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Apr 22, 2012, 15:26
Post: #2
RE: Applying linear HSV gradients
Add a layer above in "multiply" mode. White keeps luminosity, gray will darken.

or

Add a layer above in "divide" mode. Whites keep luminosity, gray will lighten.

The idea on both methods is that the 0-255 values in both top and bottom layers map to the 0.0-1.0 interval in multiply mode, you multiply the value in the bottom layer by something which is at best equal to 1, so you obtain smaller values, equivalent to darker tones. In divide mode you divide by something smaller than 1 so you obtain a bigger value, leading to lighter tones.

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Apr 22, 2012, 17:32
Post: #3
RE: Applying linear HSV gradients
How do I do either of those things? Just looking now and can't work it out.
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Apr 22, 2012, 19:11
Post: #4
RE: Applying linear HSV gradients
Ad a layer, and in the Layers list, use the selector at the top to change the layer mode:

[attachment=1109]

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Apr 22, 2012, 19:36
Post: #5
RE: Applying linear HSV gradients
OK got that. What next, it just adds a white or dark layer depending on whether I choose divide or multiply. What do I use the Blend Tool?
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Apr 22, 2012, 20:16
Post: #6
RE: Applying linear HSV gradients
You draw a black to white gradient on that layer. You can adjust the effect with the opacity slider.

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Apr 22, 2012, 20:40
Post: #7
RE: Applying linear HSV gradients
Yep got it now. Easy peasy. Cheers! :-)
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