Sharpening changes color - help?

Discussion in 'Photoshop Tutorials' started by lynn.herrick, Jun 9, 2005.

  1. lynn.herrick

    lynn.herrick Guest

    Hi, Hope someone can help me with this one, as it's driving me mad. My
    images' colour changes when I sharpen in LAB->lightness. I open the
    images using the RAW converter in PS CS and then work on them until I
    like them, then convert to LAB -> lightness to use unsharp mask. When I
    then convert to RGB the images end up with a horrible colour cast. I've
    been getting around this by making a duplicate image before I sharpen
    and then use color match to try to get the sharpened image back to the
    original, but there must be a better way. I'm probably doing something
    a bit silly, so any help or advice will really be appreciated! Thanks,
    Lynn
     
    lynn.herrick, Jun 9, 2005
    #1
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  2. You do not need to convert to LAB. The following method gives you the
    same result without converting:

    1. Sharpen the image (in RGB)
    2. Immediately go to 'Edit - Fade Unsharp Mask'
    3. Change the mode from 'Normal' to 'Luminosity'
     
    Johan W. Elzenga, Jun 9, 2005
    #2
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  3. lynn.herrick

    Mike Russell Guest

    Normally the conversion to Lab is very reversible. Converting back again
    should have no visible effect on your image.

    This makes me suspect something is wrong with your working color space
    profile.

    Are you using an unusual profile - for example a custom profile made for
    your camera - as your working space?
     
    Mike Russell, Jun 10, 2005
    #3
  4. lynn.herrick

    lynn.herrick Guest

    Thanks for the replies. I shoot in RAW mode and the image is initially
    image.nef. Would this make any difference?
     
    lynn.herrick, Jun 13, 2005
    #4
  5. The file format itself does not affect.

    I case your image is in the native color-space of the camera, it can
    easily give such color changes. In this case you need to convert the
    image to a RGB working-space profile.

    In case you convert to a non-linear working-space profile (such as the
    adobeRGB or sadRGB) then sharpening will give you the white-haloing
    around the edges and it does not sharpen the dark-end of the tonal
    range well at all. To avoid this (and many other such errors) the best
    solution is to use a linear RGB working-space.

    Timo Autiokari http://www.aim-dtp.net
     
    Timo Autiokari, Jun 13, 2005
    #5
  6. lynn.herrick

    lynn.herrick Guest

    Thank you SO much! It works beautifully. I have no idea why, but it
    works!!!

    Lynn
    ------
    You do not need to convert to LAB. The following method gives you the
    same result without converting:

    1. Sharpen the image (in RGB)
    2. Immediately go to 'Edit - Fade Unsharp Mask'
    3. Change the mode from 'Normal' to 'Luminosity'
     
    lynn.herrick, Jun 14, 2005
    #6
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