>Is there a already implemented way to adjust the likes
>of brightness and saturation in the BitBlt combination
>rules ?

I can't tell enough from your phrase "adjust the likes of".
There are now 39 rules supported in BitBlt.  Some have been
added recently and I don't know exactly what they do,
but many are described in the class comment for BitBlt,
and for any that you are not sure of, the exact code
can be found by looking for implementors of the selectors
listed in initializeRuleTable.

Hope this helps.

	- Dan
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