There are lots of image-container formats. DjVu is my favorite, and supports OCR text annotations also. But, outside of some niches, it has fallen out of use

There are lots of image-container formats. DjVu is my favorite, and supports OCR text annotations also. But, outside of some niches, it has fallen out of use these days. Adobe closed the quality gap by adding jbig2 and jpeg2000 support to PDF, making it possible to build a "bunch of images" PDF with similar quality to DjVu.