Books Api Image Links Documentation

[agustinv]

Clarification/Documentation on images associated with books might be helpful for those exploring possibilities,

For example
thumbnail:
http://books.google.com/books/content?id=nggnmAEACAAJ&printsec=frontcover&img=1&zoom=1&source=gbs_api

What do all this params do?

Are they part of an API that transforms a master image or otherwise queries from a selected set of image versions?

Modifying the zoom parameter does/can yield different results
http://books.google.com/books/content?id=nggnmAEACAAJ&printsec=frontcover&img=1&zoom=3&source=gbs_api

is a larger image.

However the smallThumbnail:
http://books.google.com/books/content?id=nggnmAEACAAJ&printsec=frontcover&img=1&zoom=5&source=gbs_api

zoom is set to 5 and its the same size as thumbnail (mmm head scratch)

Wait but there is another image with edge=curl, what if I add it to the ones above ...
If I do the curl is different between the two. Interesting ...