Added: red() green() and blue() functions

[mythril]

These work in a similar fashion to hue() saturation() and lightness(), but return a unit-less scalar between 0 and 255 as expected by the CSS rgb(x, x, x) notation.

[mythril]

You are right, I didn't read the color.js file closely enough :)

[mythril]

A simple example of how to build a contrast selector out of these functions:

.contrast-color(@sample)
    when(
        (
            (
                (red(@sample) * 299) 
                + (green(@sample) * 587)
                + (blue(@sample) * 114)
            ) / 1000
        ) >= 128
    ){
    color:black;
}

.contrast-color(@sample)
    when(
        (
            (
                (red(@sample) * 299) 
                + (green(@sample) * 587)
                + (blue(@sample) * 114)
            ) / 1000
        ) < 128
    ){
    color:white;
}

Algorithm borrowed from http://24ways.org/2010/calculating-color-contrast

[Synchro]

Take a look at #730 for a more flexible (and SASS compatible) contrast function. Got any idea of how best to implement the .luma() method I mention in that?

[lukeapage]

contrast has now been added. I still think these functions are useful. @Synchro @MatthewDL what do you think?

[Synchro]

.red() certainly reads better than .rgb[0] and only adds a very small bloat-factor, so I'm +1. How about rounding it out with .alpha()?

[Synchro]

Sorry, ignore me, we already have alpha()!

[Synchro]

I've included docs for these in less/old-lesscss.org#22

[lukeapage]

rebased (squashed) and pulled