Hi, I'm trying to register a LISS-III image using a Landsat 5 TM already registered from Geocover dataset. I'm having a problem, the output image is all black, no data in. Since the spatial resolution from the LISS (23,5m) and the TM (30m) are different, this is what I'm doing: First: ENVI --> MAP --> Registration --> Select GCPs Image to Image : I select the points (GCPs) to register and then I save. ENVI --> MAP --> Registration --> Warp from GCPs image to map I select the GCPs that I saved, I change the pixel size to 24m, I change the projection to UTM/WGS84/Zone 25S and ok. I select the LISS image to be registered, and by the right side it is showed the metafile of the image, so I copy the dimension (samples, lines) of the LISS image and ok. I change the upper left corner coordinate (I don't know why didn't recognized automatically), the pixel size is already ok with 24m, and I change the output x and y size with the dimensions that I have copied before. Also, I could go to options and " MATCHING EXISTINT FILE" and select the LISS image and all these blanks would be filled. And then ok. The outoput image as I told you before is all black without any information. Could anybody help me? I tryed select others GCPs, and happened the same. Thank you, Aline