Image Server how to set raster value to transparent?

[LucaMoiana]

Hi There,

Sorry for the maybe dumb question, checked forum and google but no luck:
I use a raster served on a local network through Image Server 9.3 and I can???t set the 0 value as transparent.
In symbology I only see ???Streched??? and ???Discrete Color???, in Strected I can set the background value on transparent but on Discrete color I can???t I can only set the 2 colors I want to use and there???s no transparent option.

THNX

L

[MelanieHarlow]

You can define the transparent value within the ISDef, so you shouldn't need to use the renderers in ArcMap. Please take a look at the content in this topic: http://webhelp.esri.com/arcgisdesktop/9.3/index.cfm?TopicName=Using_transparency_in_an_image_service...