Re: [Monotone-devel] Re: New release of monotone-viz

[Asger Ottar Alstrup]

Christof Petig wrote:
> PS: Considering auto colorizing: What about hashing branch and/or author 
> with sha1 and take the first three bytes as R,G and B. Most likely you 
> have to switch the _text_ color to white once e.g. max(R,G,B)<128 or 
> R+G+B<255. This might be a bit psychedelic but should give distinct 
> enough and stable enough colors.

Since the RGB color space is not tuned to match the human eye, you will 
get much better results using this formula:

int luminance = 0.3 * red + 0.59 * green + 0.11 * blue;
if (luminance  < 128) {
  // Choose white
}  else {
  // Choose black
}

For more details, see for instance

http://www.scantips.com/lumin.html

Regards,
Asger Ottar Alstrup