[rrd-users] Re: Good Colours to use on graphs?

> I'm struggling a bit with something so simple and stupid, but
> something that is integral to the whole idea... what colours to use?
>
> I have a total of 20 DS's, and sometimes will want all of
> these to be displayed on a single graph, however, getting the
> definition between the colours is quite akward, so I'm
> looking for recommendations of colours to be used that are
> very different to each other so I can get a 'clear' graph!


Good question. I once struggled with this too.
The way I solved it was to convert rgb to hsv. That way you get
A color wheel. You can then pick colors at even spaced angles
From the wheel. For instance if you need 6 colors, take one
With h=0, one with h=60, one with h=120 and so on.

This will not give you perfect results. You may also want to
Change S and V with each color. Let me know if you found a good
Algorithm for that :)

Here's example code for rgb -> hsv and hsv -> rgb code conversion.
Google will give you lots more.
http://www.cs.rit.edu/~ncs/color/t_convert.html

To see what the hsv colour wheel looks like, check:
http://tinyurl.com/4s8t6

Serge.

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