Am 26.10.2018 um 19:28 schrieb Kenneth:

>> As for the alpha thing, it might be worth trying `use_alpha on` in the
>> finish block. That'll turn off that texture layer's highlights and
>> specular reflections wherever the image is transparent.
> 
> Is that an undocumented feature of use_alpha? (Or perhaps I'm not reading the
> docs correctly?) In '3.6.2.6.4 Using the Alpha Channel', the only thing I see
> there that might give a clue is this:
> 
> "Note: The following mechanism has some limitations with colored highlights:

That's the documentation on alpha channel /output/. What we're looking 
at here is alpha channel /input/, which for the most part is documented 
in the section on image_map, including the old `use_alpha` mechanism.

But the additional new use of `use_alpha` keyword in the finish block is 
documented in the section on finish (pretty much as a side note). As a 
matter of fact it not only applies to image_map, but any pigment that 
features transparency.

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