How to change the colour of Dithmenos' umbra tiles?

Back Room Technical Support
1

Recently I started a char worshipping Dith. The purple aura is a bit too dark for my eyes, I’d like another colour. I had a look at

http://crawl.akrasiac.org/docs/options_guide.txt

but couldn’t find what to set in my rc-file. What do I have to do?

2 Thanks
2

I don’t know a good way to do this, but as a last resort you could edit the file dat/tiles/feat.png. The umbra is generated with 4 tiles, located after the blood and the halo.

1

The change I made produces funny results.

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2 Thanks