These were all created using the "W" key save-image
option in image-view windows.

The 2006-london-3.* were all made from a resized JPEG 
(2006-london-3.JPG, in images-mixed), to demo image-type 
conversions.  Others' names give conversions saved.
Pillow doesn't seem to support every conversion one
might dream up, but common types seem to work well.

See ../images-mixed/_README.txt for more usage notes.