nono/resizer

Resizer is a small command-line tool that fixes a frustrating problem with online photo printing services. When you upload a photo that doesn't match a standard print ratio, services like Apple's photo printing or Negatifplus just crop off parts of your image to make it fit. This tool prevents that by expanding your image's background instead, so nothing gets lost. The tool works by adding padding around your image to make it match a standard print ratio like 4:3, 3:2, or 5:4. For example, if you have a square photo, it adds space to the sides to turn it into a wider 4:3 rectangle. If you have a wide panoramic shot, it adds space to the top and bottom. You choose what color the padding is, and if you don't specify a ratio, the tool picks the closest standard one for you. This is useful for anyone who prints photos through online services but doesn't want to lose important parts of their images to automatic cropping. A photographer uploading a panoramic landscape shot for printing wouldn't have the edges cut off. A parent printing an oddly cropped family photo wouldn't lose someone's head to the service's automatic trimming. The tool processes multiple images at once and handles the math of figuring out which standard ratio is closest. The project was built in Go and uses parallel processing to handle multiple images efficiently. The author has noted several improvements they'd like to make, including adding a checkerboard pattern for the padding instead of a solid color, which would make it easier to trim the padding off later if desired. The tool is a personal project from 2012, released under the MIT license with a charming "copying is an act of love" philosophy.