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Why can't I touch-up scanned b/w PDFs in Photoshop?

Aug 19, 2008 8:23 PM

I have Acrobat 8 Professional 8.1.2 as part of the CS3 Design Premium Suite on a Mac Pro (running Leopard 10.5.4). I have a Fujitsu S510M document scanner, and recently used it to scan an enormous pile of old personal documents. Most were black and white documents (e.g. xeroxes), and with the settings I chose for these documents, the scanner's software produced what look like bitmap or 1-bit black and white PDF files. So far so good. If I attempt to use Acrobat's Touchup Object tool to clean up scanned pages in these PDFs, I get a message in Photoshop CS3 saying: "Could not complete your request because a color was specified using an unsupported color space". A peek at one of these PDFs thru Preflight reveals the following about one of these troublesome objects:

"Bits per color component: 1
Treated as a mask: False
Perform interpolation: False
Rendering intent: Perceptual
Compression/encoding
ZIP/Flate compression: FlateDecode
...
Number of color components: 1
Alternate color space
DeviceGray color space
ICC profile data
Profile version number: "2.2.0"
Color Management Module (CMM) type: "appl"
Profile/Device class signature: "mntr"
Color space of data: "GRAY"...
Profile description: "Generic Gray Profile"

Is it the DeviceGray color space that is making these objects uneditable?
Is there a color conversion I do with Convert Color or some other trick I can
do to make these objects more Photoshop-friendly?
 
Replies
  • Currently Being Moderated
    Sep 9, 2008 12:04 PM   in reply to (Larry_Auerbach)
    Why not use the CONVERT TO PDF/X-1a profile inside the preflight (strips
    the ICC profile) and then try again ....

    Jon
     
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  • Currently Being Moderated
    Sep 9, 2008 1:07 PM   in reply to (Larry_Auerbach)
    Hi Larry,

    Those errors were not related to your particular file - did it not open
    in Photoshop? Make sure you're fully patched to the latest version of
    BOTH Acrobat and Photoshop - if problems still exist then post on a
    website for us to take a look ...

    Jon
     
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  • Currently Being Moderated
    Sep 9, 2008 1:26 PM   in reply to (Larry_Auerbach)
    Why are you checking for PDF/X conformance?

    Aandi Inston
     
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  • Currently Being Moderated
    Sep 9, 2008 1:48 PM   in reply to (Aandi_Inston)
    Not checking but converting with fixups - this should remove any device
    independent colours to reveal CMYK, Grey/Separation in case Photoshop
    cannot read these out from Acrobat ....

    Jon
     
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  • Currently Being Moderated
    Sep 9, 2008 4:30 PM   in reply to (Larry_Auerbach)
    Larry,

    I cannot tell you why you cannot get to it. I couldn't in PS directly
    nor with the Acrobat touchup tool in Acrobat 9. The best way to get to
    these files is to export to tiff, where they show up as B&W. Then you
    can touchup in PS to your hearts content.

    Mike
     
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  • Currently Being Moderated
    Sep 9, 2008 10:25 PM   in reply to (Larry_Auerbach)
    The image is ICCBased Grey and indeed, Photoshop seems to have an issue
    opening the file through touch-up. If I use a third-party plugin
    (Pitstop) then I can convert back to DeviceGrey without any issues ...

    Jon
     
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  • Currently Being Moderated
    Sep 10, 2008 4:39 AM   in reply to (Larry_Auerbach)
    In Acrobat 9 Pro, you could probably use the Color Convert tool to "decalibrate" it (remove the color management profile).
     
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  • Currently Being Moderated
    Sep 10, 2008 9:39 AM   in reply to (Larry_Auerbach)
    Sorry - was on the way out of the door this morning when I typed the
    response. I could not get Acrobat to convert the colour via decalibrate,
    preflight, direct conversion of any other means inside of Acrobat ... hmmm

    Jon
     
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  • Currently Being Moderated
    Sep 10, 2008 11:46 AM   in reply to (Larry_Auerbach)
    I tried the file and also was not able to open it. It appears that the PDF has the image saved with some ZIP compression, and I'm gonna bet that there might be an error in the zip encoding. Exporting to Tiff from Acrobat worked OK for me. But oddly, using Acro 8 Pro default Tiff export settings, Photoshop says that Pixel Aspect Ratio is turned on, and the image is compressed horizontally. The image's pixel aspect ratio is .5, so maybe the compression of the image is non-standard or broken. If I turn OFF all image compression when exporting to Tiff, it was OK when opening in PS.
    I'd guess perhaps Graphic Converter's algorithm is more lenient to opening problem files than PS is. I've also seen PS report color space errors when files had non-matching file extensions (ie a JPEG saved with ".tif" or vice versa).
     
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  • Currently Being Moderated
    Sep 10, 2008 2:11 PM   in reply to (Jon_Bessant)
    I should add that when removing the ICC profile and converting to
    DeviceGrey using Enfocus Pitstop, the image did indeed open inside
    Photoshop via the Touchup Object Tool ...

    Jon
     
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