Photoshop: 16 bit calculated masks show artifacts

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  • Problem
  • Updated 4 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 7 years ago

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Brett N, Official Rep

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I've tested your workflow and see the same behavior... very strange. I'll let the engineering team know.

By the way, out of curiosity, what are you trying to accomplish with this workflow?
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Chris Cox

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Yep, there were code paths where the depth of the selection, source, and destination weren't all matched.
I just fixed it and sent it off for testing.
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David Williams

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Brett, Chris,

Many thanks for such prompt response - will be appreciated. My objective with double calculations is to try and refine the masks - possibly could do similar with levels but find multiple calculations easier to fit into actions etc.

Assuming fixed code passes testing, how will users get this update / fix?

Thanks again.

Dave
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Chris Cox

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This will be fixed in the next major release.
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David Williams

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Thanks Chris, any idea on timing or is that a state secret?
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Chris Cox

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That would be Photoshop CS6.
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Jeffrey Tranberry, Sr. Product Manager, Digital Imaging

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Official Response
Fixed in CS6 or later.