[mapserver-users] Mapping a raster colour to Transparent

[woodbri at swoodbridge.com]

Scott,

That would be the OFFSITE keyword in the LAYER section of the 
mapfile.

-Steve W.

On 21 Nov 2002 at 15:40, Tweedy, Scott wrote:

> Is there any way to use MapServer to map a specific colour value in an
> input file to end up being transparent in the output PNG or GIF?
> 
> What I am trying to do is take all the pixel values of "white" from an
> input TIFF image and map those values so that they are transparent
> when they are viewed in a mapping application.
> 
> If anyone knows if this is possible, or how to do it, I would
> appreciate it very much.
> 
> Thanks in advance,
> st
>