magento-test/lib/internal/Magento/Framework/Image/README.md

A library for processing images (photos, pictures in digital format). Features:

• Resizing
• Watermarking
• Supports Jpeg, PNG, GIF, BMP, XBM formats and different degrees of opacity
• Comes with GD (php-gd2) and ImageMagick (php-imagick) adapters out of the box