Black isn't black on Save for Web?

Discussion in 'Photoshop' started by Guest, Oct 14, 2004.

  1. Guest

    Guest Guest

    Not sure what the problem is but some images exported to the web under the
    "save for web" command, when the background color is black, are noticeably
    different from the web black. Is this problem because some images are being
    saved from CMYK to web? Why does this happen to some but not all? I think
    all the images I'm using are in CMYK format.

    Jeff
    ~~~~~~~~~~~~
    Jefferis Peterson, Pres.
    Web Design and Marketing
    http://www.PetersonSales.com
     
    Guest, Oct 14, 2004
    #1
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  2. Gifs, jpegs, what, exactly? When you say, "exported to the web", we need a
    little bit more information.

    The Doormouse
     
    The Doormouse, Oct 14, 2004
    #2
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  3. Guest

    Guest Guest

    GIF exported to the web with black canvas color.

    I think I may have found a problem though. I ran a brightness/contrast
    filter on a few images, but may have run it on the background layer by
    mistake in a couple of images...

    Jeff


    ~~~~~~~~~~~~
    Jefferis Peterson, Pres.
    Web Design and Marketing
    http://www.PetersonSales.com
     
    Guest, Oct 14, 2004
    #3
  4. Guest

    RSD99 Guest

    First:
    "The Web' doesn't know anything about CMYK ... it's **ALL**
    RGB.

    Second:
    The GIF file format doesn't know anything about CMYK ...
    it's **ALL** RGB.

    Conclusion:
    CONVERT all graphics to the RGB color space *before* you
    even think about doing anything "for The Web" with them.








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    RSD99, Oct 14, 2004
    #4
  5. Guest

    Tom Thomas Guest

    That's not entirely correct. The "Save for Web" option will
    automatically convert the files to RGB and the appropriate bit depth
    for the chosen web output (GIF or JPG). It will make all of the
    necessary conversions including color mode, flattening, removing
    excess channels, stripping excess file information, etc. regardless of
    what sort of input file is fed to it. And, it doesn't make changes
    to the original file. It actually produces a copy for the web while
    leaving the original unchanged -- a good thing.

    If the original poster isn't getting true black it's probably because
    the CMYK input isn't pure black to begin with.
     
    Tom Thomas, Oct 14, 2004
    #5
  6. Guest

    Hecate Guest

    Which is why you should convert and do a "save as" beforehand - unless
    you softproof an image, you're not going to know what it looks like
    until *after* you do it otherwise.
     
    Hecate, Oct 15, 2004
    #6
  7. Guest

    Peadge Guest

    My guess is your brightness adjustment is the culprit. CMYK color mode is
    probably a bad idea though. Have you sampled the so-called black to find the
    actual color (hex value)?

    Corey :)
     
    Peadge, Oct 15, 2004
    #7
  8. Guest

    Guest Guest

    No, I haven't. I receive these files from the print house and resize for
    the web and add a black canvas to them. I'm pretty sure the problem files
    had a brightness filter run on the backgrounds by mistake.

    Jeff


    ~~~~~~~~~~~~
    Jefferis Peterson, Pres.
    Web Design and Marketing
    http://www.PetersonSales.com
     
    Guest, Oct 15, 2004
    #8
  9. You can adjust and lock colors while in the "save for web" dialog. This
    will ensure that "black" is REALLY black, and not dark grey.

    The Doormouse
     
    The Doormouse, Oct 15, 2004
    #9
  10. Guest

    Guest Guest

    Thanks


    ~~~~~~~~~~~~
    Jefferis Peterson, Pres.
    Web Design and Marketing
    http://www.PetersonSales.com
     
    Guest, Oct 16, 2004
    #10
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