The Image Autosizer extension, besides resizing your images also adds the ability to pan them with your mouse.
In the extension`s Preferences page you can choose a different background color and much more.
Here are some key features of "Image Autosizer":
· Click image to toggle the size
· Double click to fit to width/height
· Drag image to pan
· Choose your own background color
· Support for Gmail-attachments
· Optional smooth/inertial panning
· Optional checkerboard-background
· Pressing `c` to temporarily change background color
Requirements:
· Opera 11 or later
What`s New in This Release: [ read full changelog ]
· More user-friendly preferences page (and some funky colors)
· Some bug-fixes for bugs introduced with Opera 11.10