Gain/gamma on alpha or not?


Paul Miller <pa...@...>
 

Currently I have my display config set up the same as Katana, where the gain/gamma also affect the alpha channel.

I have users asking to turn this off.

Is there a recommended way to handle this? Is there a way to tweak this in the config? Should I have a preference? Button?


Jeremy Selan <jeremy...@...>
 

Interesting.  I'm not aware of any nuke or katana users asking for this to be turned off. ;)  (And of course the nuke alpha monitor behavior is likely unchanged for many many years).

Unfortunately this isnt configurable in the config.  The code you'll need to change will probably be similar to:
and this:

(You'll want to create 3 channels of gain / gamma, instead of 4).

My vote would be as a user preference at the application level.  It seems like a UI level issue, as it doesnt have the potential to affect image output.  (So there's no fear of this setting changing render outputs on the cue, etc).

-- Jeremy


On Thu, Mar 15, 2012 at 7:00 AM, Paul Miller <pa...@...> wrote:
Currently I have my display config set up the same as Katana, where the gain/gamma also affect the alpha channel.

I have users asking to turn this off.

Is there a recommended way to handle this? Is there a way to tweak this in the config? Should I have a preference? Button?




Paul Miller <pa...@...>
 

On 3/15/2012 11:08 AM, Jeremy Selan wrote:
Interesting. I'm not aware of any nuke or katana users asking for this
to be turned off. ;) (And of course the nuke alpha monitor behavior is
likely unchanged for many many years).
Good to know. In Silhouette before v4.5 alpha overlay was never affected by gain/gamma.

Unfortunately this isnt configurable in the config. The code you'll
need to change will probably be similar to:
https://github.com/imageworks/OpenColorIO/blob/master/src/apps/ociodisplay/main.cpp#L475
and this:
https://github.com/imageworks/OpenColorIO/blob/master/src/apps/ociodisplay/main.cpp#L500

(You'll want to create 3 channels of gain / gamma, instead of 4).

My vote would be as a user preference at the application level. It
seems like a UI level issue, as it doesnt have the potential to affect
image output. (So there's no fear of this setting changing render
outputs on the cue, etc).
Agreed. Thanks for the advice.