Need to compare two photos side-by-side? Using the convert tool, you can quickly stitch two or more photos together and compare the result in any image viewer:
convert photo1.jpg photo2.jpg +append compare.jpg
The example command above stitches photo1.jpg and photo2.jpg from left to right (i.e. photo1.jpg + photo2.jpg), but you can use
-append instead of
+append to reverse the order (i.e. photo2.jpg + photo1.jpg). In both cases, the stitched image is saved under the compare.jpg name.
If you use KDE as your preferred graphical desktop environment, you can create a context action to stitch file pairs in the Dolphin file manager. Create a text file and paste the following code into it:
[Desktop Entry] Type=Service ServiceTypes=KonqPopupMenu/Plugin MimeType=image/JPG;image/JPEG;image/jpeg;image/JPG;image/jpg; Actions=Compare [Desktop Action Compare] Name=Compare Photos Exec=convert %F +append compare.jpg Icon=image-x-applix-graphics
Save the file under the compare.desktop name and move it to /usr/share/kservices5/ServiceMenus:
sudo cp compare.desktop /usr/share/kservices5/ServiceMenus/
Open Dolphin, select a pair of JPEG files you want to compare, right-click on the selection, and choose the Actions → Compare Photos action to resize the image. This generates a compare.jpg file with the selected photos side by side. You can then use your preferred image viewer to examine the photos.