POV-help is here !

Output_Alpha=bool	Sets alpha output on/off
Bits_Per_Color=n	Sets file output bits/color to n
The default type of image file depends on which platform you are using.
MS-DOS and most others default to 24-bit uncompressed Targa. See your
platform-specific documentation to see what your default file type is.
You may select one of several different file types using
Output_File_Type=x or +Fx where x is one of the following...

+FN	New PNG (portable network graphics) format
(this isn't very interesting)
Most of these formats output 24 bits per pixel with 8 bits for each of
red, green and blue data. PNG allows you to optionally specify the
output bit depth from 5 to 16 bits for each of the red, green, and blue
colors, giving from 15 to 48 bits of color information per pixel. The
default output depth for all formats is 8 bits/color (16 million
possible colors), but this may be changed for PNG format files by
setting Bits_Per_Color=n or by specifying +FNn, where n is the desired
bit depth.

-------(THIS IS INTERESTING)
Targa format also allows 8 bits of alpha transparency data to be output,
while PNG format allows 5 to 16 bits of alpha transparency data,
depending on the color bit depth as specified above. You may turn this
option on with Output_Alpha=on or +UA. The default is off or -UA. See
section "Using the Alpha Channel" for further details on transparency.

all this from the doc's -


-- 
//Spider 
( spi### [at] bahnhofse ) [ http://www.bahnhof.se/~spider/ ]
#declare life = rand(seed(42))*sqrt(-1);

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