Gamma correct RGB interpolation

[vorg]

Are you considering adding it in the future?

Interpolating RGB values without gamma correct produces darker "dirtier" colors than they should be.

The solution would be to move values to linear space, interpolate and bring it back to gamma space.

//pseudocode for R channel
var color_hex = '#FF0000';
var color = hex2bytes(color_hex);
var byte_r = color[0];
var float_r = byte_r/255;
var linear_r = Math.pow(float_r, 2.2);
var inter_r = interpolate(linear_r, linear_r_2, t);
var gamma_r = Math.pow(inter_r, 1/2.2);
var out_r = Math.floor(gamma_r * 255);

[mbostock]

This would be lovely. I’d recommend adopting an optional gamma parameter for interpolateRgbGamma, similar to what is done for Cubehelix interpolation.

[mbostock]

Your test case, above; my implementation, below:

[vorg]

Nice one. Thanks

[mbostock]

Thanks for the suggestion. :)