Should be a way to view at original size but centered

Binary package hint: gthumb

When taking multiple pictures of the same thing and comparing them for blurriness, I want to view the photos at full size and flip through them, but the focused area is in the center of the image, and gThumb, for some reason, aligns the top left of the image with the top left of the screen. It would be better if the center of the image was aligned with the center of the screen, and the edges (which usually don't contain anything of interest anyway), were off-screen.

ProblemType: Bug
Architecture: i386
Date: Sat Jun 12 14:06:17 2010
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/gthumb
NonfreeKernelModules: nvidia
Package: gthumb 3:2.10.11-1ubuntu1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/fish
ProcVersionSignature: Ubuntu 2.6.31-21.59-generic
SourcePackage: gthumb
Uname: Linux 2.6.31-21-generic i686