stonemason opened this issue on Feb 12, 2009 · 3 posts
stonemason posted Thu, 12 February 2009 at 6:40 AM
hey guys..anyone know how to invert the green channel of a bitmap via nodes?
as an example http://stefan-morrell.com/SKWallBN_Flipped.zip
one of the normal maps in there has the green channel inverted via photoshop..is it possible to do that with nodes alone?
Thanks
Stefan
bagginsbill posted Thu, 12 February 2009 at 7:11 AM
Yep.
Use a color math subtract node, Value_1 = WHITE, Value_2 = WHITE->your map. That is a negative of your map - all three channels inverted.
Now one more color math Add node, Value_1 = MAGENTA -> your map, Value_2 = GREEN -> your subtract node (the negative).
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stonemason posted Thu, 12 February 2009 at 7:30 AM
