If you'd edited the image in a specific area and saved it in a lossless image format such as PNG, then those modified pixels will be displayed in yellow. If DiffImg now just displays a blank grey pane then it means the images are the same - it's found no differences.
Interpreting this can be a little tricky, as there are several viewing options on offer, but the best approach is probably to select "Difference Image" and "Display Difference Image" on the toolbar (the 6th and 8th icon - they have tooltips if you're unsure). And after a second or two of analysis, you'll see a pixel mask which highlights their differences. Launch the program and it'll ask you to select the two images (there's support for opening BMP, GIF, ICO, JPG, MNG, PBM, PGM, PNG, PPM, TGA, TIFF, XBM, and XPM files). But to find out for sure, you should use DiffImg, a simple tool which can visually highlight the pixel differences between two images of the same size. And opening both images and comparing them side by side could be useful, too. Checking the file size might be helpful in a general sense. If you regularly edit images then occasionally you might find yourself with two versions of the same original picture, and wonder how (or even if) they're different.
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