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Image resize

This script will resize all images in a folder to be less than 1MB in compressed size (hopefully).

Usage

imres /path/to/folder

The specified image folder can also include subfolders, which may contain additional images.

How is it downsized

For the purpose of speed it is very straightforward

  • Compute the ratio of (compressed image size / 1MB)
  • Downsize the dimensions of the image by sqrt of the ratio

This approach does not guarantee that the image will be 100% less than 1MB but it never failed me (over 100k images were a success). Please note that the script doesn't optimize the new dimensions of the image, so the resized image might be smaller than necessary.

Output format

All images will be converted to JPEG. PNGs with no background will be converted to JPEG with white background.

EXIF

The resized image will be rotated based on the EXIF orientation information, but will not have any EXIF metadata after processing.