This bash script uses ImageMagick's convert to help creating thumbnails, it was born to create sticker images for Telegram.

The default values are 512x512 for the size and thumbnails as the destination directory, but can be changed with the -d and -s options respectively before listing the images.

If the image doesn't have the right rateo for the size, it's embedded in a bigger square with a transparent background.

Example

I'm converting two images, the first one is a 474x474 square jpg, the second one is 960x540 rectangle png. The originals can be found in the example folder.

Requirements

Convert by ImageMagick, instructions on how to install here.

Install

# Clone the repository
$ git clone git@github.com:lfoscari/telegram-sticker-resizer.git

# Navigate to the directory
$ cd telegram-sticker-resizer

# Execute the script
$ ./thumb
usage: thumb [-d destination] [-s size] images...

If you don't want the full repository simply move the thumb executable anywhere in your $PATH.

Notes

This script can be run on Windows Subsystem for Linux, you may need to invoke bash explicitly for it to function:

bash thumb [-d destination] [-s size] images...