On Sat, 2008-04-12 at 16:22 +0200, Rolf Steinort wrote:> 

< snip >

> I don't get what the lower layer does. I'll ask a friend an d report
> back. Perhaps there is something interesting in it. 

Nothing interesting. 

I just talked to John Arnold from http://photowalkthrough.com/ (worth to
look into even for Gimp users). He told me that this is an old method
and has less control than the channel mixer. 

The lower layer just rotates the colours. That leads to a different
luminosity and so to different monochrome output. 


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