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  1. #1
    Join Date
    Nov 2009

    Question How to find CIEL*ab value from Bitmap?


    I have an image with 300*300 pixels. I am getting this image from spectral camera.
    I want find CIELAB value (*L *a *b) from images.
    I want to map the image pixel in 400 to 700 nanometer/Wave length graph.
    Please suggest how to get RGB value from image and how put this on
    CIELAB equation. Or Suggest right way to achieve this thing.

    CIE L*a*b* (CIELAB) is the most complete color space specified by the International Commission on Illumination (Commission Internationale d'Eclairage, hence its CIE initialism). It describes all the colors visible to the human eye and was created to serve as a device independent model to be used as a reference

    Last edited by mahendra_g; September 24th, 2010 at 11:58 PM. Reason: Update

  2. #2
    VictorN's Avatar
    VictorN is offline Super Moderator Power Poster
    Join Date
    Jan 2003
    Hanover Germany

    Re: How to find CIEL*ab value from Bitmap?

    What is a "CIEL"?
    What is a "CIEL*a*b* value from Bitmap file"?
    Victor Nijegorodov

  3. #3
    Join Date
    Nov 2002

    Re: How to find CIEL*ab value from Bitmap?

    If you have spectral data, and you want to graph it, then it seems wrong to map to CIELAB space. The spectral data has infinitely more information (dimensions) in it, and you throw all that information away when you map to the 3-D CIELAB space.

    The same is true for a mapping to RGB space.

    What are you trying to accomplish? Maybe something like the graphs shown in Figure 2 of this paper: http://papers.cnl.salk.edu/PDFs/The%...02000-3503.pdf? Note that the paper is an arbitrary one that I found in a quick search for graphs of spectral data.

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