topic Re: Image difference tool in Image analysis for ArcGIS (ERDAS Extension) in ArcGIS Image Server Questions https://community.esri.com/t5/arcgis-image-server-questions/image-difference-tool-in-image-analysis-for-arcgis/m-p/507916#M928 <HTML><HEAD></HEAD><BODY><SPAN>I can not reproduce. How are you creating your subset? I used the clip and did a subtract on the original and the clip and got 0 back.</SPAN></BODY></HTML> Fri, 28 Jan 2011 22:09:28 GMT PeterBecker 2011-01-28T22:09:28Z Image difference tool in Image analysis for ArcGIS (ERDAS Extension) https://community.esri.com/t5/arcgis-image-server-questions/image-difference-tool-in-image-analysis-for-arcgis/m-p/507915#M927 <HTML><HEAD></HEAD><BODY><SPAN>For test purpose, I selected an image and a subset of the same image. Then under image analysis - utilities - Image difference selected. here for the before theme ( i selected the actual image) and before layer as layer_1 and After theme I selected ( subset image) and before layer was again layer_1. Everything else of default. I was thinking results would come as "unchanged" rather it came all increased 10 % . I am confused here. why didnt it came unchanged?when its same image just an subset. Please help.</SPAN></BODY></HTML> Fri, 28 Jan 2011 20:03:48 GMT https://community.esri.com/t5/arcgis-image-server-questions/image-difference-tool-in-image-analysis-for-arcgis/m-p/507915#M927 VarunaGupta 2011-01-28T20:03:48Z Re: Image difference tool in Image analysis for ArcGIS (ERDAS Extension) https://community.esri.com/t5/arcgis-image-server-questions/image-difference-tool-in-image-analysis-for-arcgis/m-p/507916#M928 <HTML><HEAD></HEAD><BODY><SPAN>I can not reproduce. How are you creating your subset? I used the clip and did a subtract on the original and the clip and got 0 back.</SPAN></BODY></HTML> Fri, 28 Jan 2011 22:09:28 GMT https://community.esri.com/t5/arcgis-image-server-questions/image-difference-tool-in-image-analysis-for-arcgis/m-p/507916#M928 PeterBecker 2011-01-28T22:09:28Z