Hello, I have two different types of aircraft-collected imagery. The first image is georeferenced, and I would like to use it to georefence the second image, which has no geographical information. I tried selecting ground control points in each image. However, the warped image is black, ie there is nothing in it. What could I be doing wrong? Here's the step-by-step procedure that I'm doing, 1) Open up my georegistered JPW file, 20060715_Run25_rgb_1m.jpg, in Display #1 and my ungeoregistered image file image_test.tiff in Display #2. 2) Map > Registration > Select GCPs image to image Base image is Display #1, warp image is Display #2 3) Choose 5 points. RMS error is 6.36 4) Options > Warp File Input warp image: image_test.tiff, warp parameters polyunoial, degree 1, nearest neighbor, background 0. Output image extent Upper left X 1024 Upper left Y 3262 Output samples 1054 Output lines 616 Output results to file Total cache size 25,165,824 bytes Inmemory use 59126850 bytes Available 0 bytes Output size 1947792 bytes Output to file, name junk But then junk is all black! What did I do wrong? The geographic coverage of the input file is much larger than the file I'm trying to warp. Could that be the problem? Thanks, Kathleen