I must admit that I have not followed the whole pbr discussions over the last couple of months, so I might not know what I'm talking about but wouldn't it be easier to just insert an output map (like my ggx conversion) instead of destructively alter maps in PS via a Lut ?
I was actually going to send you a PM when I got back online.
Would be awesome if you could add a little "IOR Fix" button or something to the Converter.
I sampled every glossiness value from 1-0.
Here's the range and values.
Glossiness 1.00 - 0.26 should be mapped to 187 RGB aka IOR 1.50
Glossiness 0.25 - 0.14 should be mapped to 194 RGB aka IOR 1.42
Glossiness 0.13 - 0.00 should be mapped to 205 RGB aka IOR 1.33
When the image is loaded as gamma 1.0 the RGB is 212, 217, 225
This output should connect to the same map as the GGX Output and not after the GGX Output.
I'm using the LUT non destructively with the "VRayLut map", but not everyone has vray installed.
"Convert to log space before applying LUT" need to be disabled in the map.