I don't think what your asking for is possible directly, but you could use
another lossless image format (such as TGA), or remove the alpha value
from the PNG file and use filter all 0.5.

-Nathan

Alexander Fried wrote:
> 
> I am trying to project am image onto a wall. My scene consists of one
> plane a screen, a light source and a second plane between the light and
> the screen holding the image:
> 
> ------------- screen
>   \       /
>  -----------  image
>     \   /
>      \ /
>       o       light
> 
> I am using a png image. Each pixel has an alpha value of 128. POV uses
> this alpha a transmit and therefore only gray shadow is visible. The
> "filter all" keyword crashes on 3.1e (Windows) and 3.0 ignores it. The
> only way I found, is using gif, but I don't want to reduce the color.
> The best solution would be to tell POV it should use the alpha channel
> as filter. Does anyone know if this is possible or is there another way
> to do it?
> 
> Thanks,
> 
> Alex

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