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I have published an Image service with ArcGIS Server 10, containing the results of an interpolation operation. The Image which is returned from the service is in greyscale.

I wish to render it with a stretched color ramp, with the following properties: enter image description here

The RestEnd Point API, mentions that a rasterFunctions Parameter has to be given as a renderingRule, for the Export Image Operation. The given samples for the rasterFunctions are very limited, And I haven't been able to create a rasterFunctions which causes any noticeable change in the exported output.

Where can I find more details about rasterFunctions? Or build the rasterFunctions Object to get the same result as shown in the window?

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This is the main ESRI page

http://desktop.arcgis.com/en/arcmap/latest/manage-data/raster-and-images/creating-custom-raster-functions.htm

And this is a Github page with more info

https://github.com/Esri/raster-functions

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