Results 1 to 4 of 4

Thread: Mapping RGB to CIE to multiple lines?

  1. #1
    Join Date
    Aug 2009
    Location
    Bristol, England
    Posts
    333

    Default Mapping RGB to CIE to multiple lines?

    Hi all,
    Are there any colour scientists here?

    I am hacking around on laser colorimetry, and am currently looking for a solution to the problem of producing multi line output given RGB input.

    It seems that starting with some assumptions about what wavelengths the RGB is assumed to be, we can produce (non normalised) CIE co ordinates via a couple of interpolated lookup tables, and that given a set of output wavelengths and relative powers we can produce a gamut (That will be a 3d surface representing what we can do for any given brightness level, and there are typically multiple solutions).

    The problem comes with mapping the 3 space CIE coordinates onto the gamut(s) as there are typically multiple solutions depending on how you are willing to trade total brightness for ability to retain a constant gamut at varying brightness levels.

    At the moment I have multiple Octave models none of which I am really happy with.

    The linear algebra I can handle, it is the general approach that is giving me fits.

    Does anyone have better references then the sci.engr.color FAQ?

    Regards, Dan.

  2. #2
    Join Date
    Jan 2006
    Location
    Charleston, SC
    Posts
    2,147,488,805

    Smile

    Suggest you contact Casey Stack at Laser Compliance Inc, or else Greg Makhov at Laser Systems Design Inc. Either one would probably enjoy a good color theory discussion, and should be able to assist you with this.

    Adam

  3. #3
    mixedgas's Avatar
    mixedgas is offline Creaky Old Award Winning Bastard Technologist
    Infinitus Excellentia Ion Laser Dominatus
    Join Date
    May 2007
    Location
    A lab with some dripping water on the floor.
    Posts
    9,186

    Default

    Take a look at ref two at the back of this:

    http://www.optics.arizona.edu/opti58...omeTheater.pdf

    Then there is this

    http://www.optics.arizona.edu/opti58...amut_Laser.pdf

    Then this:
    http://extranet.spitzinc.com/referen...tion_Deter.pdf

    http://www.smpte.org/journal/?p=1880

    www.academypublisher.com/ojs/index.php/jmm/article/download/.../1791

    [8] J. Y. Zhang, H. F. Lin, S. G. Yang, Multiple regression laser
    display color system establishment, Optical Instruments, Vol.
    30, (2), 2008. The original JPEG compression standard is efficient at low to medium levels of compression with relatively low levels of loss in visual image quality and has found widespread use in the imaging indust...

    J. Imaging Sci. Technol. / Volume 51 / Issue 3 / General Papers

    New Set of RGB Primaries for Display Covering Full Range of Real World Object Colors

    Journal of Imaging Science and Technology -- May/June 2007 -- Volume 51, Issue 3, pp. 243-(5)


    None of the links have the math, unless you obtain the papers, but a few of them have people to contact....

    Ok for a start? I might be able to dig up real stuff on Saturday.



    What you are looking for will be in siggraph or SMPTE or SPIE some place.
    Steve
    Last edited by mixedgas; 11-26-2010 at 11:12.

  4. #4
    Join Date
    Aug 2009
    Location
    Bristol, England
    Posts
    333

    Default

    Some cool stuff, thanks Steve, got a bit of reading to do.....

    Regards, Dan.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •