Use correct coefficients to get luminance from a color in linear space

[mrsaturnsan]

vec3(0.299, 0.587, 0.114) should be used with gamma corrected SRGB colors, not with linear colors.

https://stackoverflow.com/a/56678483

TO FIND LUMINANCE:

...Because apparently it was lost somewhere...

Step One:

Convert all sRGB 8 bit integer values to decimal 0.0-1.0

  vR = sR / 255;
  vG = sG / 255;
  vB = sB / 255;
Step Two:

Convert a gamma encoded RGB to a linear value. sRGB (computer standard) for instance requires a power curve of approximately V^2.2, though the "accurate" transform is:

sRGB to Linear

Where V´ is the gamma-encoded R, G, or B channel of sRGB.
Pseudocode:

function sRGBtoLin(colorChannel) {
        // Send this function a decimal sRGB gamma encoded color value
        // between 0.0 and 1.0, and it returns a linearized value.

    if ( colorChannel <= 0.04045 ) {
            return colorChannel / 12.92;
        } else {
            return pow((( colorChannel + 0.055)/1.055),2.4);
        }
    }
Step Three:

To find Luminance (Y) apply the standard coefficients for sRGB:

Apply coefficients Y = R * 0.2126 + G * 0.7152 + B *  0.0722 

Pseudocode using above functions:

Y = (0.2126 * sRGBtoLin(vR) + 0.7152 * sRGBtoLin(vG) + 0.0722 * sRGBtoLin(vB))