ExecutePixel color fidelity



  • On 23/01/2016 at 13:25, xxxxxxxx wrote:

    User Information:
    Cinema 4D Version:   R13-R17 
    Platform:    Mac  ;  Mac OSX  ; 
    Language(s) :     C++  ;

    ---------
    I'm struggling to understand why I paint colors with ExecutePixel() on my VideoPost and they do not come out as expected. I understand this method should give me full control on the final pixels, but it doesn't.
    I made a simple test. On a new project, only my plugin added to the scene, no other posts. I paint everything with 50% white, using the code below...

    void MyVP::ExecutePixel(BaseVideoPost* node, PixelPost* pp, Int32 x, Int32 subx, Int32 suby)
    {
    Float32 *col = pp->col;
    col[0] = col[1] = col[2] = 0.5f;
    }

    The result is around 73% white, not 50%.
    Even stranger, it varies between 73% and 74%!
    What's altering the result???



  • On 23/01/2016 at 17:38, xxxxxxxx wrote:

    Another example, a linear gradient based on Y, besides a linear gradient made in photoshop.

    void Blendy360CamVP::ExecutePixel(BaseVideoPost* node, PixelPost* pp, Int32 x, Int32 subx, Int32 suby)
    {
    Int32 y = pp->line;
    Float32 *col = pp->col;
    col[0] = col[1] = col[2] = (Float)y / _res.y;
    }



  • On 24/01/2016 at 00:42, xxxxxxxx wrote:

    Have you tried unchecking Linear Workflow?



  • On 24/01/2016 at 06:02, xxxxxxxx wrote:

    That's a well kept secret! :)
    I didn't know about this, thanks.


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