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Pinkish hue on hi-res scan of B/W photos into Photoshop

Discussion in 'Digital Photography & Imaging' started by ITTF Museum, Jan 17, 2006.

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  1. ITTF Museum

    ITTF Museum Thread Starter

    Joined:
    May 17, 2004
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    Hello Group,

    I'm trying to scan (600dpi) B&W glossy photos, enlarge them and print them on photo paper for an exhibit I am planning.

    They are coming into Photoshop with a sort of pinkish/purplish hue and print that way too. Really disappointed, as it seems I will now have to hire a professional shop do these enlargements unless I can somehow tweak some settings in Photoshop or the scanner/printer so that the scan/Photoshop/print comes out looking like the B&W originals.

    Can anyone suggest how to get rid of this unwanted hue? I selected print only B&W and that got rid of the hue of course, but the result was grainy and flat compared to the full color print with the hue.

    I have not experimented with gamma settings or others.

    Hope someone can help.

    Thanks.

    Charles
     
  2. buck52

    buck52 Banned

    Joined:
    Mar 9, 2001
    Messages:
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    Got to run to work but a couple of quick questions that might help when someone else comes along...

    What scanner?
    Can you eliminate Photoshop as the problem... it's probably not... by opening to another program?

    buck
     
  3. ITTF Museum

    ITTF Museum Thread Starter

    Joined:
    May 17, 2004
    Messages:
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    Hi Buck, Thanks for looking in.

    My scanner/printer is a Lexmark X5130. Have not tried other programs but can experiment and send the scan into the Lexmark image handler. I will also try 300dpi scan to note any differences.

    Charles
     
  4. lister

    lister

    Joined:
    Aug 10, 2004
    Messages:
    1,993
    Are the images being scanned in RGB or Grayscale? You could try converting to Grayscale once scanned.
     
  5. slipe

    slipe

    Joined:
    Jun 27, 2000
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    In Photoshop go Image > Mode > Grayscale. You can also try Image > Adjustments > Desaturate and compare it to the grayscale.
    Either will get rid of the tint. You might want to mess with the black and white sliders in Levels – don’t use Contrast.

    The poor quality printing black and white is that some printers like HP use only the black cartridge for the B&W selection, and that uses pigmented ink that isn’t appropriate for photo paper and has a lower resolution. If you choose grayscale with HP it mixes the colors to get B&W for photos so it can use higher resolution and avoid that purplish haze the pigmented ink leaves on large black areas. But sometimes grayscale can give a tint of its own.
     
  6. ITTF Museum

    ITTF Museum Thread Starter

    Joined:
    May 17, 2004
    Messages:
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    Thanks to all who looked in. Slipe and lister's suggestion of converting to grayscale after the scan (via Image>Made>Grayscale) produced a much improved print on photo paper.

    Keep up the great work - what a great site! I have made a donation in the past for such incisive help received on TSG.

    Charles
     
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