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Determining Color Difference Using the CIELAB Model?

Posted by Cliff on from the calculating-the-visible-distance-between-two-colors dept.

Colour Blind asks: "I am working for a not-for-profit organization developing a website for kids. I am attempting to develop a method for testing if two colours (as defined by R, G, and B values [0-255]) are adequately different to be visible on top of each other. So far I have tried many things but this is the one that, by all accounts, should work: I have converted from RGB to (CIE)XYZ using a 3x3 matrix transformation. From here I have used three more equations to convert to CIELAB colour. I have then calculated the distance between the two colours in question in CIELAB colour space. The results are not correct: there are pairs of colours that are quite far from visible that yield the same difference as colours that are plainly acceptable for visibility. Any suggestions?"

10 of 199 comments (clear)

  1. First Post by Anonymous Coward · · Score: -1, Offtopic

    First Post.

    1. Re:First Post by Anonymous Coward · · Score: -1, Offtopic

      If n = first post, then n + 1 equals the post which you posted, and to which I replied. Therefore, you did not, in point of fact, get a first post. Better luck next time!

  2. Solutions by thecarson · · Score: 0, Offtopic

    HolyColor does just this. Check it out, but it's only for Linux.

  3. ::Runs crying into the corner:: by flerchin · · Score: -1, Offtopic

    Holy mother of god, what is this about?!!

    Just reading the question makes me want to cry in my proverbial beer. In fact I think I need to go get a drink, just to lessen the pain.

    In summary: HUH?

    --
    --why?
  4. Usenet? by Lord+Omlette · · Score: 0, Offtopic

    groups.google.com

    --
    [o]_O
  5. I am confused by wessideg · · Score: 0, Offtopic

    I too fail to see the use of posting such a story on a site of this nature. But it does sound interesting.

  6. Suggestion. by Anonymous Coward · · Score: -1, Offtopic

    Get a study group of kids and ask them what they think about the colors in question :P

  7. Re:Try the Value in HSV instead by Anonymous Coward · · Score: -1, Offtopic

    I understand that this is off-topic, and for that I am sorry. However, I was curious as to which distro you would recommend: Debian, or Slackware? I've heard good things about both.

  8. Re:Read this relevant document by Anonymous Coward · · Score: -1, Offtopic

    Red Hat, fool. There is no other distribution that's worth a damn, particularly the European ones.

  9. Re:Read this relevant document by Anonymous Coward · · Score: -1, Offtopic
    I'm not sure if you are new to slashdot and linux, or if you are asking this question as a joke, however just in case the former is true I will offer you this advice:

    Slackware is geared for experts, and requires more expertise to get going, while Redhat is geared for newbies. I recommend Mandrake if you're just getting started with Linux.

    The slashdot crowd is fairly crass about offtopic posts, etc., so it would probably be best to submit your query as an "Ask Slashdot" question in the future.

    Also, there has been a lot of coverage of many of the various Linux distributions on Slashdot over the years. A quick search of the archives might help you make your final determination.

    best of luck.