To save a wallpaper, you can use the locate-app tool to find the executable of your preferred image editing software (e.g., GIMP or Adobe Photoshop), and then use its command-line interface to save the image.

Here's a brief snippet in Windows Command Prompt:

gimp --new 1920x1080 --color-space sRGB --file "C:\Users\YourUsername\Pictures\wallpaper.png" --output wallpaper.png

Replace YourUsername with your actual username, and adjust the image dimensions as needed.

Note: This is just a basic example. You may need to modify the command depending on the specific software you're using and its command-line interface.