Ugly Woodgrain Patterns On Pictures

Discussion in 'Photoshop Tutorials' started by lynn, Nov 12, 2003.

  1. lynn

    lynn Guest

    When I open my pictures in the Windows Picture And Fax Viewer they
    look crystal clear and print crystal clear as well. But when I open
    them in Photoshop, or another program called Photo Impression, they
    have ugly woodgrain looking patterns on them and they print like that
    as well. Anyone know the cause and what can be done?
    Any help is greatly appreciated.
     
    lynn, Nov 12, 2003
    #1
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  2. lynn

    Dave Guest

    Sounds like JPEG artifacts to me.

    David
     
    Dave, Nov 13, 2003
    #2
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  3. Doesn't sound like it to me. But we're both trying to imagine
    something we haven't seen. Lynn, can you post an example to the Web?
     
    Stephen H. Westin, Nov 13, 2003
    #3
  4. lynn

    jjs Guest

    Sounds like GIF dithering - too many colors in the image to manage with the
    limited pallet. Post the image somewhere.
     
    jjs, Nov 13, 2003
    #4
  5. lynn

    Tacit Guest

    Sounds like JPEG artifacts to me.

    Nope, that'd be something else.

    The original poster specifically mentioned FAX software. I believe he is
    opening 1-bit bitmap FAX images. If you take a complex bitmap image and reduce
    it in size on your screen by zooming out, the image will display a moire
    pattern. Depending on the image, this moire pattern can be swirly loops, which
    look vaguely like wood grain.

    The solution is simple. Do not zoom out. Look at the image at 100%
    magnification.
     
    Tacit, Nov 13, 2003
    #5
  6. Except they said it prints that way too. That has got to be more than just
    changing the zoom factor on the screen.
     
    David C. Barber, Nov 14, 2003
    #6
  7. lynn

    Tacit Guest

    Except they said it prints that way too. That has got to be more than just
    A 1-bit bitmap may exhibit undesireable moire if it's printed at a resolution
    that does not scale to the resolution of the printer, or if it's printed at a
    reduced size. Still, it shouldn't be as bad as the on-screen display.
     
    Tacit, Nov 14, 2003
    #7
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