Show HN: Distinct Color Palette generator using Red-Yellow-Blue colorspace

http://afriggeri.github.com/RYB/

by friggeri • 14 years ago

18 21 14 years ago

afriggeri.github.com

MartinCron• 14 years ago

This is really great. I wound up doing something like this by hand (by eye?) the last time I needed to generate a distinct color palette (player colors in an online map game).

guard-of-terra3• 14 years ago

I press the generate button and then nothing happens. Firefox here.

friggeri5• 14 years ago

Fixed by removing the generate button, it was totally useless anyway as the update happens directly when you change the number of colors to generate.

guard-of-terra3• 14 years ago

I change and change it but nothing happens.

drv• 14 years ago

The "ceiling" symbols (left/right square bracket upper corner) at the beginning of the explanatory text are displayed as unknown character boxes here (Win7/Chrome).

lbotos3• 14 years ago

I'm not the OP but did a little looking at the source. It's encoded as UTF-8 and is rendering fine in Chrome on Mac. Can someone more experienced with Character Encoding chime in? I've always wanted to learn more about how things like this happen. (I assume it's a character encoding issue?)

friggeri5• 14 years ago

Not really an encoding problem, I suppose the issue arises because the fallback font does not have those symbols. I can't test on Windows but if someone could point me to a font which has those mathematics characters on Windows I'll gladly specify that font.

jmelloy• 14 years ago

Neat. By pure happenstance, I needed a bunch of colors for plots and state diagrams yesterday.

mistercow2• 14 years ago

It would be neat if you could add different color models to optimize for different kinds of color blindness.

friggeri5• 14 years ago

Do you have any reference for that ? (mathematical models of color blindness) ?

mistercow2• 14 years ago

This thesis[1] might help as a starting point. It is primarily focused on simulating colorblindness for the non-colorblind, and gives some transformations between trichromatic and dichromatic vision.

[1] http://www.lume.ufrgs.br/bitstream/handle/10183/26950/000761...

dredmorbius• 14 years ago

Similar concept: I like to be able to generate terminals of varying-but-viewable color schemes. I'd like to tweak this to use more an HSV than RGB scheme.

#!/usr/bin/gawk -f

function ranint (x) { return int(rand() * x) } function hex (x) { return sprintf("%02x", x) }

BEGIN {

     mc = 96             # max color

     # Seed RNG using nanoseconds
     cmd="date +%N"
     cmd | getline seed
     close(cmd)
     srand(seed)

     r = ranint(mc)
     g = ranint(mc)
     b = ranint(mc)
     printf( "rxvt -bg \x27#%s%s%s\x27 -fg gold -cr blue &\n", hex(r), hex(g), hex(b) )
 }

inconditus• 14 years ago

What's pretty cool is that if you generate 1000+ the colors begin to become muted and look "foresty". Why's this?

friggeri5• 14 years ago

Because the colors at the end are the one which are closest to the average of all those before. In RYB, the average is what you'd obtain by mixing paints of those colors, so a really earthy tone.

malandrew• 14 years ago

Why not use CIE L*ab, since that colorimetric system is based on human perception or difference?

Show HN: Distinct Color Palette generator using Red-Yellow-Blue colorspace

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