topic Re: Image Service Issues in ArcGIS Image Server Questions

Image Service Issues

AaronSchuck — Thu, 06 May 2010 20:19:45 GMT

I have been having an issue with published image services that I've been creating. I will go through the process of publishing an image service within an mxd, everything will turn out great, I can host the image on our servers and pull it up no problem.

The thing is, there is a standard deviation stretch applied to the image when I pull up the service in Arcmap. The problem is fixed easily enough, I just go into the properties of the service, and turn the stretch off. But I want to know why this stretch applies in the first place...? There is even a portion within the image service creation wizard that asks if I want to apply a stretch. I always make sure that this option is left unchecked, yet the stretch comes up in my hosted images every time. Has anyone else run into this problem?

Re: Image Service Issues

PeterBecker — Fri, 07 May 2010 15:01:43 GMT

The issue is that in one of the processes stats for the service were created and are associated with the service. When ArcMap opens a raster that contains stats it by default applied a 2StdDev stretch. This can be turned off in the ArcMap 'Tools,Option,Raster, Display rasters with contrast stretching' option. This though is only for one machine. There does not exist a specific tool to remove the stats from a service. The simplest method is to open the xxx.ISDef/ImageService.ISDef file with a text editor. Find and delete the node called <Bands> IE the section
      <Bands>
        <ActualValues>true</ActualValues>
        <Alias>Histogram Generation for ImageService</Alias>
......
     </Bands>
You will need to recompile the service.
Do not run the Build with the "Compute output properties" else the stats will be regenerated.

Re: Image Service Issues

AaronSchuck — Mon, 10 May 2010 14:41:33 GMT

Hey man, thanks a million! It worked like a charm! I really appreciate your help.