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, 5 Oct 2011 CPOL
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Eric, sorry for the confusion, I think I wrote it too quick:Guillaume's library uses sRGB with D65 white ref. If you want to continue using that conversion, then just copy/paste RGBtoXYZ and XYZtoRGB into your code.you get a correct codethe calculation is more precise with the expanded...

Eric, sorry for the confusion, I think I wrote it too quick:

Guillaume's library uses sRGB with D65 white ref. If you want to continue using that conversion, then just copy/paste RGBtoXYZ and XYZtoRGB into your code.


  1. you get a correct code
  2. the calculation is more precise with the expanded constants.

If you would like a conversion which is very similar to Adobe's, then you need to do the other proposed changes as well: RGB Bradford at D50.

Here is the ready copy/paste XYZtoRGB for RGB Bradford:

public static RGB XYZtoRGB(double x, double y, double z)
{
    // using RGB Bradford Working Space Matrix and D50 Reference White
    double[] Clinear = new double[3];
    Clinear[0] = x*3.1338561 - y*1.6168667 - z*0.4906146; // red
    Clinear[1] = -x*0.9787684 + y*1.9161415 + z*0.0334540; // green
    Clinear[2] = x*0.0719453 - y*0.2289914 + z*1.4052427; // blue

    for(int i=0; i<3; i++)
    {
        Clinear[i] = (Clinear[i]<=0.0031308)? 12.92*Clinear[i] : 
                      (1+0.055)* Math.Pow(Clinear[i], (1.0/2.4)) - 0.055;
        Clinear[i] *= 255.0;
    }
        // looks a bit cleaner than before :-)
    return new RGB((int)Clinear[0], (int)Clinear[1], (int)Clinear[2]);
}

If you need help for the rest, just shout.

Rob

BTW, you can make a chicken fly, it all depends on the height of the building...

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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Rob2412

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Comments and Discussions

 
GeneralThanks a lot ! I will post my new code in few minutes. (Sean... PinmemberEric Ouellet4-Oct-11 9:33 

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