On 2/12/2023 6:21 AM, Kenneth wrote:
> The documentation at     3.2.4.1 Output File Type   says,
> "Note: In version 3.7 alpha handling for image file OUTPUT has changed.
> Effectively, the background *now requires* a filter or transmit value in order
> for alpha transparency to work properly...The philosophy of the alpha channel
> feature in POV-Ray is that the background color should not be present in the
> color of the image when the alpha channel is used..."
> 
> So even for quick tests of using Output_Alpha (or +ua) to make a .png
> alpha-channel render, I have always dutifully added at least a
> background{rgbt 1} statement to a scene-- because I thought at least *something*
> was required there.
> 
> But if there is no background *at all* in a scene, Output_Alpha can be used by
> itself and still work correctly. Duh.
> 
> I must have been mis-reading the docs all this time...although the 'requirement'
> statement is a bit misleading, IMO. Or a little tidbit of clarifying info was
> overlooked.
> 
> You would think that, at *sometime* in the past, I would have made a mistake
> writing even a simple scene and discovered this little fact by chance. But no.
> :-(
> 
> Anyway, I learned something new...today!
> 
> 
> 
> 
And over a year later this thread saved my current rabbit hole project.

Thank you.

Uncle Josh

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