Askaniy Anpilogov

First two rows of renders by Björn Johnson (at the bottom of [this site](https://bjj.mmedia.is/3dtest/index.html)) compare the current photometric model fairly accurately to what I suggest: 

Nice!

@375gnu hmm. It looks like the gamma correction was applied to the final body render, not just the shading model. In what I suggested, the textures shouldn't change (see figure).

Looks like the result is fine, but wouldn't it be more efficient to add gamma correction directly to the shading model? It should be a formula that calculates the brightness...

You are right, then there is no data loss. Although the method is not optimal for this task, it's easier to add features to it. For example, we can implement...

@375gnu was the atmosphere turned on on Saturn?

If an atmosphere is not the problem, then the render engine is not providing enough quality of shadow transition for gamma correction. It makes previously invisible artifacts visible. Not sure...

Thanks, you're right. But I just indexed palette of texture and tested it, and it worked fine. So the problem is something else.

Sudden sequel. It seems that there is also a bug in the specular maps of a certain type, I will study it.  

I checked Puck's textures and these specular maps for the mode in Pillow (Python library). Сlear result: **Celestia doesn't read correctly PNG textures with the indexed color palette**, it's the...