INFO:

A generation loss comparison at very high quality settings: quality 90 and higher for JPEG (default=75), quality 95 and higher for WebP (default=75), quantization 15 and lower for BPG (default=29, lower is better quality), quality 66 for lossy FLIF. The first frame of this video shows the lossless images (as lossless as possible in the format), the next frame shows the sizes at the lowest quality of the range (there is a different quality scale for each format; it is chosen to get roughly the same filesize at the lowest quality), and from then on, quality settings are chosen randomly within the range.