JSH nous apporta ses lumieres en ce 2007/07/18 12:09:
> Hi!
> 
> I've started to work with PovRay recently and I wonder how to get an indexed
> image file. As the standard output formats are .png or similar image formats
> that don't allow any access to the indexed image, but directly contain an
> RGB image.
A GIF image is indexed (into a colours palete), as is a 256 colours BMP, PNG, 
TGA and others.
> 
> a) Am I right that .df3 density files contain such indexed image data?
Those are density files, NOT image files. It contains RAW values for voxels 
within a given volume. There are no indexes to speak of. It may be tough of as a 
kind of volumetric, uncompressed, black and white, targa image. Any form of 
indexing is external to the file, independent from it, and totaly arbitrary.
> 
> b) If so, how can I gain access to the .df3 file when I produce an image
> with PovRay?
POV-Ray don't output DF3s, nor does it use them internaly, it can use them to 
modulate the density of a media. It can also use them to generate an isosurface.
> 
> c) Is there an even better way to obtain indexed image data?
Convert an image generated to an indexed format: reduce the colour depth to 8 
bits per pixel (256 colours) or less (16 = 4 bpp, 8 colours = 3 bpp, 4 colours = 
2 bpp).
> 
> 
> Grateful for any help,
> 
> JSH
> 
> 


-- 
Alain
-------------------------------------------------
"We returned the General to El Salvador, or maybe Guatemala, it's difficult to 
tell from 10,000 feet."           -- Anon.

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