clipka <ano### [at] anonymousorg> wrote:
> Am 07.08.2014 04:19, schrieb liujg:
>
> >          image_map { gif "DHKX0221.gif"  transmit 0, 1.0}
> >                  }
> >           finish {
> >        specular 0.3
> >        roughness 0.01
> >                  }
> >              }
> >   // translate <1,  2, 5>
> > }
> > Such as can render to have result picture,but I change image_map { gif
> > "DHKX0221.gif"  transmit 0, 1.0}to image_map { png "DHKX0221.png"  transmit 0,
> > 1.0}. The povray will have a parse error ,keyword "transmit"cann't use with non
> > color_map image.Why? Thank you.
>
> In .gif image files, for each pixel only a single value in the range
> 0..255 is stored: This is an index into a table of RGB colours (the
> so-called "palette").
>
> The syntax
>
>      image_map { gif "DHKX0221.gif"  transmit 0, 1.0}
>
> tells POV-Ray that each pixel referring to the first entry of the palete
> should be treated as being transparent.
>
>
> PNG files (normally) don't use a palette, but store RGB colours for each
> pixel, so the above approach does not work.
SO How can I use PNG files which contains alpha channel to be treated as being
transparent in some area.
Thank you .

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