New Layer Difference Mode broken

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  • Updated 2 weeks ago
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This conversation has been merged. Please reference the main conversation: Photoshop 21.2: Moving layer leaves duplicate/shadow image

I open a (raw image). I (on a Mac) use Cmd-shift-N to create a new layer. In the dialog box I chose Difference as the blending mode. I then attempt to fill the layer with white, which should give be a negative image. Nothing happens. However, if I make that layer invisible, then the layer below it shows up in negative. THis also happens if I create the new layer from the context menu and select Difference at that time.This does NOT happen if I make the new layer with Ctl-Shift-N and then set the blending mode in the Layers panel. It only began with the latest update (21.2.0 on Mojave)
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Dennis Geller

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Posted 2 weeks ago

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Dave Grainger

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There is a difference between "broken" and "not understanding something"
(Edited)
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Dennis Geller

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Centainly true. Also between "not understanding how something is supposed to work" and "not understanding why something started working differently after a year of doing the same thing nearly every day" and "not understanding who making a layer invisible  applies that layer's blending mode to the layer beneath it." Of course possibly the definition of blending mode changed suddenly and I missed the memo. I'd be real happy to have this new phenomenon broutht within my understanding.
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Dave Grainger

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Hi Dennis:  I, too, have  hard time figuring out the rapid succession of changes. Compounding that is the fact that most of us use a relatively small percentage of features in any complex software program, and the entire system has been evolving at an increasing pace. Example: my primary use is photography and processing, doing wildlife stuff...

I am thinking that there will be a response from one of the Champs and or others pretty soon, from which we always learn! (They don't seem to send me the memos either.!)
(Edited)
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Dennis Geller

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Additonal data. Today, having freshly launched PS, I added a new layer (cmd-shift-N) and then filled it with white. Changing the blend mode to Difference did not change anything. When I made the new layer invisible, I saw an all black field. Making the base layer invisible showed the negative version of it, which remained when I made both layers visible.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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If you go to Preferences > Performance... and uncheck "Legacy Compositing" does it work correctly?
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Dennis Geller

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Seems to! Thanks. With your question I found that there is a (somewhat diffrent) "known lissue" involving legacy compositing (https://helpx.adobe.com/photoshop/kb/known-issues.html). [Now I have to find a description of "new" versus legacy compositin]

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Legacy is the old way which is less modern, desktop based and more CPU bound. The new compositing model, which will be the only option in a future update, is modernized, cross-platform/mobile based, and more GPU friendly. (roughly)

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