[mapserver-users] Mapping a raster colour to Transparent

[Hankley, Chip]

Scott...

are you talking about making some portion of a raster based layer
transparent? If so, use the OFFSITE parameter.

Chip

-----Original Message-----
From: Tweedy, Scott [mailto:sctweedy at NRCan.gc.ca]
Sent: Thursday, November 21, 2002 2:41 PM
To: MapServer Users (E-mail)
Subject: [mapserver-users] Mapping a raster colour to Transparent


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