reduce 16 bits to 8 bits

Discussion in 'Photoshop' started by pshaw, Jun 7, 2009.

  1. pshaw

    pshaw Guest

    for some reason one of my 16 bit tif pix cannot be reduced to 8 bits!
    the 8 bit option is greyed out. i tried converting it to a psd but the
    8 bit option was still greyed out. any suggestions how to get the 8
    bit option back?


    pshaw, Jun 7, 2009
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  2. pshaw

    Joel Guest

    I don't know what you are looking at, but if you want 8-bit then just save
    to JPG then you have no other option but 8-bit
    Joel, Jun 7, 2009
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  3. pshaw

    pshaw Guest

    unfortunately saving to 8 bits is not an option for any file that is
    16 bits in photoshop cs4

    pshaw, Jun 7, 2009
  4. pshaw

    pshaw Guest

    fabulous idea ... but ..."not enough scratch memory" ... and i have a
    scratch memory only 160 gig hard drive! the image is only 350 megs or
    so ... strange ...

    but nice idea :) ...

    pshaw, Jun 8, 2009
  5. pshaw

    pshaw Guest

    yep ... one can see the /16 in the top of the image

    pshaw, Jun 8, 2009
  6. pshaw

    pshaw Guest

    according cs4 it is in rgb mode ...i can send a screen shot
    documenting this ...

    pshaw, Jun 10, 2009
  7. pshaw

    pshaw Guest

    shangara was kind enough to post a work around ...i created an 8 bit
    blank image of the same dimensions ...copied the 16 bit into it, ok'ed
    the conversion to 8 bits and it was a done deal ...

    but ...i still wonder why the conversion of the original image was
    greyed out ...oh well ...

    pshaw, Jun 10, 2009
  8. pshaw

    Rob Guest

    If that worked then try a "save as" of your tiff file close and reopen
    it and see what happens.

    In the past I have had problems with tiff files that were not correctly
    recognised in PShop 7.0? They were scanned slide images from the Nikon
    film scanner.
    Rob, Jun 10, 2009
  9. pshaw

    pshaw Guest

    the problem with that image is that it is about 400 megs :) ... and
    .... as it is 16 bits i can't reduce it to a jpg :) ...

    but shangara's suggestion to copy it to a same size 8 bit image worked
    .... strange ...

    pshaw, Jun 11, 2009
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