[Bf-committers] Color space and alpha issues

[Matt Ebb]

On Mon, Dec 19, 2011 at 8:03 PM, François T. <francoistarlier at gmail.com>wrote:

>
> As usual I'm more for the teaching rather the hiding :)
> As Matt said, only comp expert are going to want to mess with this anyway
> (I'm even sure some expert will bypass it in some cases). But people who
> wants to get serious about it will have to learn it no matter what with any
> application out there
>

I don't think hiding anything's a good idea, on the contrary I think it
needs to be more explicit, but above all it should work correctly by
default for simple scenarios. I agree its better for peoples own sake that
they learn this stuff for more advanced usage, but it shouldn't be a
requirement in order to get blender to do simple things correctly.

I think probably a nuke style solution with premul default but options on
each node to un-premul/premul before and after its operation would be a
good way to go. This could mean that
a) It could be switched on by default for nodes that need it, so a simple
setup throwing down a file in and a colour correction node will just do the
right thing
b) hopefully if individual nodes had these sorts of controls, if you want
to keep your input unassociated, troublesome nodes like defocus and vector
blur could infer this and take it into account, hopefully not mangling your
data so much if you want to keep it around.
c) you could of course turn all these options off and do it all explicitly
if you want too.

cheers

Matt