how to do things like " R=R/M, G=G/M, B=B/M", M me

[augustzhuang]

how to do things like " R=R/M, G=G/M, B=B/M", M means matt
in inferno or flame? Because I can not find divide in logic operation.
Some times my 3D guys give me some rendering premutiplied
images with motion blur or grow, so I must use shake to unpremutipled
the images first (it means makea operation as R=R/M, G=G/M, B=B/M) , then import new one into my inferno ,because inferno does not
support premutiplied images.

So can anyone tell me how to solve it in inferno or flame?

[imported_neonmarg]

For some unknown reason divide is not an option in logical ops, it has been asked for many times and the subject comes up often on flame-news.
Options?
-Sapphire sparks Math Ops has a divide. http://genarts.com/sapphire-sparks.html
-Knoll UnMult http://www.digitalanarchy.com/knoll_unmult.html


UPDATE: Divide is now part of Flame 8.5/Inferno 5.5

Jeff

[goran]

Any news on this subject in v5/v8 ?

Goran

[augustzhuang]

Thank you ,jeff.
And could you please tell me
where can I find some guide or
tutorials about expressions? Because
the contend in the discreet USER GUIDE
is too simple. Thank you.

[nomagic]

Easy just use the NO:magic's divide logic op plug-in check out http://www.nomagic.co.uk

Shameless plug but it's quick & gets the job done!

[kuban]

Also if your foreground image is premultiplied with blck, you can use "add" mode to composite the foreground image. This way, no black edge problem will happen, but transparency won't work in layers.

[Xavier]

Inferno 5.5 / Flame 8.5 has Divide in logic ops. (FINALLY!)

-- Xavier