Python script for scaling all images in a directory by a factor of 2. Useful for adapting programs that do not natively support GUI scaling on 4k machines by making the icons larger.
Install the Python Pillow library.
pip install pillow
$ python scale-images.py [--dry-run] path/to/directory
Pass --dry-run to print out the intended changes without actually modifying any files.
Recursively descends all directories, modifying every square jpg and png image. Maintains a journal of modified files in the root directory so it can resume if cancelled or does not accidentally enlarge multiple times.