On Ubuntu 22.04, I'm trying to find a solution for finding out if an image has a black border around it. On Windows, I used to use MS Office Picture Manager. When an image is opened up in Picture Manager, it happens to have a creamy background with the entire image in the foreground:
But when an image is opened on Ubuntu, either with Image Viewer or with Shotwell, it has a black background, with the image in foreground so like this:
This makes it impossible to tell if the image has black borders that I may want to crop out.
Any help is appreciated.