I'm looking for an image viewer that, when an image is clicked, ...
a) will start in full-screen mode (or at least gives the image most of the screen)
b) will auto-resize the image to fit the screen
c) has no performance problem with a huge image folder
[d) an option to rename the currently displayed image would be a plus]
Normally, I'm quite happy with Faststone image viewer, but that only takes care of a) and b) [and d)] - it's a bit slow when it comes to images in a huge folder.