Photoshop: "Color" blending works incorrectly with semitransparent layer on square canvas

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  • Problem
  • Updated 1 month ago
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  • (Edited)
When I use "Color" blending, I got incorrect color under the some circumstances.

OS: Win10x64-1809 (OS build 17763.437) or Win7x64
Photoshop: 20.0.4 20190227.r.76 2019/02/27: 1205725 x64

Steps to reproduce:
  1.  Create PSD with 1080*1080 canvas size.
  2. Create layers group
  3. Create red rectangle inside the group (use Rectange tool)
  4. Set Stroke to None in the rectangle settings
  5. Set Opacity=95% for the rectangle
  6. Use Free transform to stretch the Rectangle on the whole canvas
  7. Set Color blending for layers group
  8. Remove white bacground layer
Expected result - semitransparent red color over the whole canvas. Something like this

Actual result - semitransparent black layer

Also, when I exporting the group with "Quick export as PNG", I expecting semitransparent red color, but get the whole black color without transparency.

The problem gone if I turn on "Use old compoistion core" in settings. The problem can't be reproduced on non-square canvas sizes and unstable reproduces on different canvas size (like 100*100px")

For the reference - the screenshot with document settings and rectangle layer setting

Comment for myself - referenct to my local ticket PTT-1852
Photo of Serg


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Posted 1 month ago

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Photo of Jeffrey Tranberry

Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Official Response
Hi Serg,

Go to Preferences > Performance... and enable "Legacy Compositing"

Thanks for reporting. I will have engineering investigate.
Photo of Serg


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Oh, it called "Legacy Compositing" in english :) Yes, I already tryed it and it solved the issue. I mistakenly translated the option's name as "Use old compoistion core" (see initial report text).
Thank you! Hope, it will be fixed soon.