As beaker suggests, try the fastextend lib. It includes many more blend modes than standard blitz3d. It may have what you need. Try posting in the userlib section of the blitz3d forum, referencing fastextend lib. The author is usually around.
image/texture inversion-negative
Blitz3D Forums/Blitz3D Programming/image/texture inversion-negativeThe forum is locked. These are the original blitzbasic.com forums, kept so they can still be read. No new topics, replies or edits can be made here. To join in, head over to the Blitz3D+ forums.