[Bald Eagle wrote:]
> > http://wiki.povray.org/content/Reference:Finish

[Clipka wrote:]
>
> 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)...

Thanks. All clear now.

I see now that my confusion is just documentation-related. The keyword index for
'use_alpha' (in the 'newer' documentation that can be downloaded for v3.7.1 etc)
takes the user to only one docs section,  3.6.2.4.2 Image Pattern  --with only a
single link there to "Using the Alpha Channel". Seems that the keyword should
instead have two (or three?) entries in the index, additionally for 'Finish' and
'image_map'.

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