Color interpretation - same texture color, different results

[artmanphil]

Howdy folks,
Im working on some cartoony fluffy clouds, polymodels. After some Ambient Occlusion Baking I decided to color them in photoshop. But the results were different - so I decided to give the textures in photoshop a constant color, to check out what happenes in softi.

So what we have are (check attachment):
1. Two float rgb images, same exakt color (0,65,255).
2. One linear workflow (Sun/Sky initiated), color management in softi enabled, color profile auto, gamma 2,2
3. a mia lightsurface with intensity 30000 to make the constant stuff visible in linear workflow (by the way, is there a better way to do so?)

What could I do or check, to find out, why the textures are displayed in different ways?

[artmanphil]

Solved partially - one had an empty alphachannel, the other no alpha channel at all. Any idea, which switch there is saying somthing like "mutliply by alpha", "rgba or rgb" or such?

[grahamef]

For "rgba or rgb", you can use RGBA Split to separate the RGB and alpha.

For "multiply by alpha", you can plug the alpha into a Scalar to Color, then plug both colors into a Color Basic with Operation set to Multiply.

There are probably others ways.