Images: Images in books have artifacts

[trevordblack]

Many of the pictures in the html files have obvious signs of artifacts.

There are compression artifacts, maximization artifacts.

Near as I can tell, none of these artifacts produce a wrong-looking or misleading image, but the image quality is occasionally noticeably poor.

[hollasch]

Agreed. I've always planned on revisiting the images, but never got around to creating an issue; thanks.

Need to determine desired general image resolution. Some images (like surface acne) might show better as blown-up PNGs.

[trevordblack]

We are aware of the problem.
This (#179). #155, and #145 are all probably going to make the next release (2.1.0 or 2.0.1).
We are in no position to merge anything for the next few weeks.

[hollasch]

Aras P fixed most of these issues for book1. See PR #230.