Image difference tool in Image analysis for ArcGIS (ERDAS Extension)

3455
1
01-28-2011 12:03 PM
VarunaGupta
New Contributor
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.
0 Kudos
1 Reply
PeterBecker
Esri Regular Contributor
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.
0 Kudos