help colourblind folk at colour correction

Discussion in 'Critique Forum Archives' started by Brian_barrett, May 25, 2006.

  1. Brian_barrett

    Brian_barrett TPF Noob!

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    Hi,

    I recently read a step by step guide for colour blind people on how to perform colour correction. If this works, it it will instantly lift one of my biggest frustrations in photography. Some times i can see that a picture isn't quite right,.. but in tying to get it right i end up with something quite unnatural.

    Well anyway, I had a go and would really like to know what you think about the colour corrected image. does it look natural? does it look good?

    here's the original (left of top) and my colour corrected attempt (right or bottom):

    [​IMG] [​IMG]


    thanks for you time and comments,

    Brian
     
  2. Kevin D Burns

    Kevin D Burns TPF Noob!

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    the top image looks as if it was shot with the white balance on your camera set to tungsten. (if you where using a digital camera that is)
    a bit strong of a blue cast on the snow.
    The bottom image is natural looking..............
    but has a "very, very, very" and I stress very, light blue cast still on the snow.
    Under the sled there is a blue shadow, I think it should be the color of a shadow.
    Hmmmmmmmmmm
    Now, you have me thinking about the way things look over snow. LOL!!
    For being color blind, I think it looks great. Your doing fine.
     
  3. mcoppadge

    mcoppadge TPF Noob!

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    I agree, although I can't tell if it's really there or it's a color trick because of how close it is to the other photo. Somehow I don't think I'd notice the blue if it weren't side-by-side with the other photo.
     
  4. greasemonkey

    greasemonkey TPF Noob!

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    Looks fine to me. Personally when I'm outside all day in the snow and you look at stuff, it does kinda give a little blush tint.
     
  5. LaFoto

    LaFoto Just Corinna in real life Staff Member Supporting Member

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    If your question is whether this programme yields the right results after a colour correction, I'd say, yes, I think it does.
    Apart from the remaining bluish shadows in the corrected version, I at first found that version (side by side with the too blue photo) a bit on the pink side, but I fear this is caused by the blue photo right next to the corrected one.
    If you simply want to know: "Does the programme do what I can't do myself with my vision?", then: yes.
     
  6. Brian_barrett

    Brian_barrett TPF Noob!

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    Thanks everyone,

    I now have more confidence to tackle some old images which I had abandoned as "a job for someone with normal colour vision". Also in regard to the blue tinge that remains - yes, i did that intentinally... The method I used has the following steps:

    1. read the RGB values from a pixel that should be black
    2. correct each colour curve for that pixel to RGB=[0 0 0]
    3. read the RGB values from a pixel that should be white
    4. correct each colour curve for that pixel to RGB=[240 240 240] (not 255 because apparently when printing the image its best if all pixels have some ink layed to paper)
    5. read the RGB values from a pixel that should be grey
    6. correct each colour curve for that pixel to RGB=[x x x] where x is the average of the grey pixel's RGB index.

    It is step six where i left some blue. I had thought that perhaps white snow in shadow should actually be reflecting the blue sky a little? and was attempting to err on the side of caution a little.

    Thanks again.

    Brian
     
  7. Rob

    Rob TPF Noob!

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    It's certainly close enough... Nobody would say "the colour's off" if you posted it in critique - it's only cos we're looking at a very blue version first - the mind plays tricks.

    Rob
     
  8. Onyx

    Onyx TPF Noob!

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    the second is fine.(to fix it completly open curves or levels click on the middle/grey eyedropper and click anywhere on the snow that doesnt have a shadow on it.) the blue shadow is natural.:| a semi-transparent blue plastic sled is going to cast a blue shadow.
     
  9. markc

    markc TPF Noob!

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    The second images looks very magenta to me, and a trip to Photoshop confirms it. A sample spot from the "white" cloud shows 195R, 188G, 219B. A color balance adjustment of +20G and -30B still leaves it a bit blue, but that works for a snow scene and it's much more neutral looking than the magenta. After this, I think it needs a slight contrast boost using curves to get the white a bit more white and not grey.
     
  10. markc

    markc TPF Noob!

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    I don't think that works and leaves the image without a true white and lower contrast. If there's something white in the image, it usually pays to have at least one pixel at 255,255,255.
     
  11. craig

    craig TPF Noob!

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    Try keeping the channels palette open when colour correcting. You will be able to see which channels are too muddy or plugged up. In this case I would convert to cmyk and lighten the cyan and magenta channels.
     
  12. Oldfireguy

    Oldfireguy TPF Noob!

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    I'm color blind, RYG and the best tool I have found is to have my wife sitting next to me when I color correct.
     

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