FromArgb vs FromScRgb

Question

Should these two expressions result in colors which are roughly the same?

Color.FromArgb(255, 255, 255, (byte)0.25 * 255))

Color.FromScRgb(1.0f, 1.0f, 1.0f,         


        

Answer 1

Try to use ColorFloatToByte method to have your desired results:

private static byte ColorFloatToByte(float val)
{
    if (!(val > 0.0)) // Handles NaN case too
        return (0);
    else if (val <= 0.0031308)
        return ((byte)((255.0f * val * 12.92f) + 0.5f));
    else if (val < 1.0)
        return ((byte)((255.0f * ((1.055f * 
               (float)Math.Pow((double)val, (1.0 / 2.4))) - 0.055f)) + 0.5f));
    else
        return (255);
}

Usage:

Color.FromArgb(255, 255, 255, ColorFloatToByte(0.25f)))

Color.FromScRgb(1.0f, 1.0f, 1.0f, 0.25f))