The PSP also has image viewing support. The following script will extract all images from a comic book archive (CBR/RAR/ZIP file) and format them properly for viewing on the PSP. It will shrink images down to 720 pixels in width which should be more than large enough to read on the 480 pixel wide PSP. The smaller image will then load faster on the PSP.
The directory created underneath your picture folder will be the same name as the CBR file.
The script relies upon the ImageMagick convert program.
Usage: extract_comics -d <mount path to pictures on psp> cbr_file1 cbr_file2 …