Goal: Be able to publish a referenced 1-band continuous raster to Image Server with symbology for a color ramp defined entirely on the source and maintain values for that raster in the resulting service.
As described here:
https://community.esri.com/t5/arcgis-image-server-questions/raster-imagery-layer-with-color-ramp-on-...
There does not seem to be a way to apply a Color Ramp in a source Raster Function Template (RFT) that maintains the values for a raster (unless the raster values are conveniently 0 to 255). From my understanding, RFTs are the only way to apply any symbology to a source raster prior to publishing. We have had success with thematic rasters and applying RFTs with Attribute Tables.
The Raster Function for Color Ramps only works if pixel values are stretched from 0 to 255. In Pro (LYRX) and in Map Viewer (Styles), a color ramp can be applied to a raster that then applies that ramp across the range of values. Update Raster Functions so the Color Ramp function is able to support this as well. This would allow the symbology for an Imagery Layer to be defined at the source by applying the Raster Functions to the source mosaic.
We are currently working around this by putting a published Imagery Layer raster in a Web Map and symbolizing it there. Being able to define the symbology on the source would give us a single source of correct settings and prevents the extra work to create the Web Map and symbolize the raster in Portal. This is basic supported functionality for vector-based layers. Please extend that capability for raster layers.
