In article <38A8D08B.BF35F77E@hotmail.com> , Pabs <pab### [at] hotmailcom>  
wrote:

> using background { rgba <1,1,1,1>} (a for alpha) when outputing an image
> should (if the selected file format supports it) add an alpha channel to
> the image - this would be useful

Alpha channel output is already support by POV-Ray using the "+UA" switch.
See section "File Output Options" in the official documentation for details.


       Thorsten

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