rule of thumb regaring sRGB vs linear colors

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@RyanB;536640

Vailias’ response makes sense.

You should definitely see a change in the viewport when toggling srgb on/off for a texture but you may have to recompile the material to see it. The same thing happens when you change to NearestNeighbor filtering. It wasn’t always like that. When I just tested it I did not have to recompile; it updated instantly but it could have changed due to engine version.

If you are ever in doubt, I would recommend using the “Debug Scalar Values” function and import a 50% grey texture. That means fill with 127 in photoshop. With srgb gamma, that 0.5 value will be remapped to ~0.21 (which is close to 0.5 ^ 2.2 which is the legacy srgb curve). But if you set sgrb to false, the texture will read exactly 0.5 again.

hi guys…
thnx all for the input and detailed info! It makes sense now. I tried out the grey texture trick with the debug scalar node. It indeed shows the expected values. This helps me to have a clear understanding of what is going on and how to create my textures. I am on UE 4.11.2 btw, on my mac it worked.
I noticed however that non sRGB texture requires me to change the texture sampler in the material editor to linear color instead of color. Otherwise it gives me an error.
Anyways, I can figure it out now how to setup the proper settings.
Regards! T