Photoshop: 16 bit calculated masks show artifacts

  • 2
  • Problem
  • Updated 3 years ago
  • Solved
  • (Edited)
16 bit calculated masks - issue of random squares on mask that destroy effectiveness.

Am using CS5 v12.0.4 64bit ona Win 7 64bit Ultimate PC with 12Gb RAM. I do not believe the problem is only one of display.

I started with a 16bit RGB image and my detailed workflow was - I only had a background layer -

Image | Calcuations | Source 1 channel = Gray | Source 2 channel = Gray | Blending | Screen (Overlay also shows issue but this image was too dark for good demo) | Result = selection

I then

Image | Calcuations | Source 1 channel = Selection | Source 2 channel = Selection | Blending | Screen | Result = selection or new doc or new channel

If you choose new channel, you see an alpha channel witht hese random squares where the mask is not applied correctly.

However, if you "result" the first calculation as a "New Channel" and then recalculate you do not see the issue.

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David Williams

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Posted 6 years ago

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Photo of Jeffrey Tranberry

Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Official Response
Fixed in CS6 or later.