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

  • 6
  • Problem
  • Updated 3 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).

Please feel free to reach out for more details.SaveSave
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Rasmus Keldorff

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  • Frustrated (but not really surprised)

Posted 4 years ago

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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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