Photoshop CC 2017: Group blending modes acting differently for 16/32 bit images (broken transparency rendering)

  • 6
  • Problem
  • Updated 2 years ago
  • Solved
  • (Edited)
Since upgrading to CC17 I have experienced various weird-looking documents. Something seems to be wrong with alpha levels in preview composition.

For instance, a document which looked fine 2 days ago, now exhibits layers that, even when set to 100% opacity, are only visually 20-30% opaque.

Investigated a bit further, and as feared, the bug seems to be caused by overlaying a blended group (see attached images)

 

Notice that hiding the group (which only contains various dark overlays being Linear Dodge'd onto the underlaying document) "fixes" the transparency issue.

In a different instance, the background layer in a Smart Object would not render unless the top layer blending with it was 100% filled (ie somehow it "masked" the underlaying background).

It's clear to me that there's something wrong with the composition engine, and blending, in CC17 — Mac only though. We tested for the issue on our Windows machines, and nothing wrong there.

Experienced with Mac (El Capitan, CC 17 18.0.0).


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Rasmus Keldorff

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  • Frustrated (but not really surprised)

Posted 2 years ago

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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