Add Shadows/Highlights to the list of options for New Adjustment Layers.

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  • Updated 3 years ago
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Please add Shadows/Highlights to the list of options for New Adjustment Layers.
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Gordon Osmundson

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Posted 6 years ago

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Chris Cox

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Shadow&Highlights does filtering operations (area operations) that are not allowed in adjustment layers -- so it cannot be an adjustment layer.

Adjustment layers can only do per-pixel color adjustments (one pixel in, one pixel out), not area filtering (many pixels for input needed to calculate a single pixel of output).

if we allowed area filtering in adjustment layers, the compositing process would get very slow, very quickly (we tried it, and the experience was really really bad). The math just does not allow it to perform reasonably, even with faster processors.
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Bob McAfoos

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This reply was created from a merged topic originally titled 1. Photoshop Elements: Include an Adjustment Layer for Shadows and Highlights..

I try to teach my students to use adjustment layers, for example Levels, and then Shadows and highlights which I see as very powerful has to be done the unforgivable way.
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Michel BRETECHER, Champion

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Bob,
See the answer by Chris Cox.
In less technical words, the shadow/highlight ajustments work both as a curves adjusment and local contrast adjustments (like 'clarity' in ACR or local contrast/ edge enhancements/ sharpening).
The 'curves' type adjustment means that the adjustment applies the same math formula to any pixel, independently from the neighbouring ones. The 'clarity' or 'sharpening' effect is calculated based on the value of neighbouring pixels.
It's easier and much quicker to combine different formulas acting on a given pixel (vertically) than to take the effects of neighbouring pixels (horizontally) at the same time.
For the same reason, you don't have clarity or sharpening adjustment layers.
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Bob McAfoos

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I think I understand most of what you said. To me it's Curves Lite, which is pretty darn nice for me and others.
My point is that I wish it were like a Levels Adjustment Layer in that it could be turned on and off, have its opacity adjusted, have a mask applied and then improved if necessary. That is so much more powerful than permanently changing pixels and having to save before and after copies of layers so that if you mess up you can go back, as I'm sure you know.
Thanks for listening.
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WILLIAM CAMPBELL

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This reply was created from a merged topic originally titled Photoshop: is it possible to have image adjustment "shadow/highlight" available a....
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WILLIAM CAMPBELL

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Understood. I had a feeling the degree of pixel alteration was a big reason it was not already an adjustment layer. I will continue with my current workflow, in which I keep an original layer and an adjusted layer. Thanks.