Test images for AVIF, compressed by various tools.
AVIF is a new format to get the smallest (possibly) lossy images. Unsure about lossless.
You can visit/star/clone all the test images repos at GitHub.
Latest files are in 202105.
MIT, though art, photos, website screenshots are (c) of their respective creators. I tried to use "Free for commertial use" for 3rd party artistic content. Website screenshots are in 'fair use' due to the nature of this testing (small snipit in context). I may have used only a portion of 3rd party files, so do not expect clones.
Please see the source files' repo at test-images/png for detailed author & copyright information.