Global Output map on all diffuse

[Morne]

Hi all

How can I put a global output map that affects only all diffuse channels? In other words I want to globally make all my materials darker no matter if it only has a diffuse colour or a diffuse texture map. Kinda like the old days when Lele suggested we go for 0.255 on output on everything. But I want to go 0.7 or so one shot on everything. Even if a shader it already has an output in diffuse, I AGAIN want to affect that shader and all others with a new "global override"
No I don't just want to lower exposure or lower ligthing multiplier. I want to darken all materials one shot (only the diffuse).

Anyway to do that?

[glorybound]

Maybe, somehow, you can apply the color correction to all the diffused slots. It could be an instance color correction, so when you change one, it'll change them all. Now, having said that, I have to clue how to implement it.