How to derive percent color in a photograph?

Discussion in 'Photography Beginners' Forum' started by awk004, Jan 12, 2010.

  1. awk004

    awk004 TPF Noob!

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    Hi,
    I'm new and am by no means an expert at digital photography. I have taken a series of photos for a research project in the same lighting and at the same distance. I would like to derive the percentage of green in the photos to use for comparison. I have CorelDraw X4 and Adobe photoshop CS4. Is there any method to get the percentage of select colors from these photos?
    Thanks for any advice,
    AWK
     
  2. HikinMike

    HikinMike No longer a newbie, moving up!

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    I'm using CS2...

    Use the 'Eyedropper Tool' and select the area. Then select the 'Color Picker' and make sure you don't check 'Only Web Colors'. You should be able to see the RGB and CYMK percentages.
     
  3. KmH

    KmH Helping photographers learn to fish Supporting Member

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    I'm only seeing CS4 defining the percentages of CMYK, and not RGB percentages. Plus it is only giving those numbers for the pixel under the cursor with single pixel selected.

    I don't think you can select an area and get what it is you want as "green".
     
    Last edited: Jan 12, 2010
  4. awk004

    awk004 TPF Noob!

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    Is there any program that allows you to get percentages per unit area?
    Thanks
     
  5. HikinMike

    HikinMike No longer a newbie, moving up!

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    I didn't mean to say RGB as percentages, just numbers. :blushing:


    I'm not sure I understand. :confused:
     
  6. awk004

    awk004 TPF Noob!

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    A program that would allow me to highlight an area of a photo and then analyze the highlighted area to return a percentage of amounts of colors.
    Thanks so much for the help
     
  7. KmH

    KmH Helping photographers learn to fish Supporting Member

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    How are you going to define "color"?

    In RGB each "color" is a combination of Red, Green and Blue, each somewhere between the values of 0 and 255. I would think the best a program could do is average an area.

    In CS4 you can select the color sampler tool and set it to sample an area 101 pixels by 101 pixels.

    Pure Red would be 255, 0, 0.
    Pure Green would be 0, 255, 0.
    Pure Blue would be 0, 0, 255
    Pure White is 255, 255, 255.
    And Total Black is 0, 0, 0.
    Diferent tones of grey have all three RGB colors equal 100, 100, 100 would be a shade of gray. A lighter shade of gray would be 150, 150, 150.

    Good luck with your quest.
     
  8. awk004

    awk004 TPF Noob!

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    Thanks everyone for all the help.
    Awk
     

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