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kayr23628964
kayr23628964
Known Participant
March 31, 2016

P: Split channels on large CMYK files gives glitches when converted to bitmap or saved as tiff

  • March 31, 2016
  • 10 replies
  • 1609 views

This has happened to me on CS6 and now with CC on OSX running El Capitan. When I split channels on a large CMYK file the resulting files look fine, but when I convert them to bitmap or save them as a grayscale .tiff or .psd I wind up with glitched files. This does not happen if I cut and paste the channel into a new grayscale file, so I think it is a bug in the split channels code. Original CMYK file was 7393x5700 pixels

BITMAPPED WITH A HALFTONE SCREEN




SAVED AND REOPENED AS A GRAYSCALE TIFF


ORIGINAL IMAGE AFTER SPLITTING CHANNELS ( BLACK CHANNEL )

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    10 replies

    J
    J453
    Legend
    June 21, 2016
    Chris fixed this issue fixed fixed this issue in the CC 2015.5 upgrade released today: https://blogs.adobe.com/photoshop/2016/06/adobe-releases-major-photoshop-cc-update-today-and-announces-more-digital-imaging-product-features-coming-soon.html
    F
    FeedbackCommunityMember
    Inspiring
    April 1, 2016
    Yep, those steps (transparency, large image) were both important.
    I've implemented a fix for this in the next major release of Photoshop.
    F
    FeedbackCommunityMember
    Inspiring
    March 31, 2016
    Ah, yeah, that is something that wasn't mentioned in previous reports.
    And that tells me where the error might be...
    kayr23628964
    kayr23628964Author
    Known Participant
    March 31, 2016
    That's great! Also easy to work around now that I know.
    J
    J453
    Legend
    March 31, 2016
    That was the secret. I have a repro case now. Engineering will look into it. Thanks for your help!
    kayr23628964
    kayr23628964Author
    Known Participant
    March 31, 2016
    I can also send you the file I used if you can't replicate the bug, but I was able to get it to happen with a file I created in photoshop.
    J
    J453
    Legend
    March 31, 2016
    OK. The sounds like it might be the secret sauce. Let me try that.
    kayr23628964
    kayr23628964Author
    Known Participant
    March 31, 2016
    It only happens if the CMYK file is not flattened and split channels creates a transparency channel. I can create a new file the same size and there is no problem. Double click the background layer to make it Layer0, and the glitch manifests. I flattened the original file and now there is no glitch.
    J
    J453
    Legend
    March 31, 2016
    I wasn't able to reproduce this creating my own CMYK file, splitting the channels and saving a tiff of each file using the default settings in the Tiff options dialog,
    J
    J453
    Legend
    March 31, 2016
    Does this happen consistently (100% of the time) with all files or this particular file?
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