If you happen to have a very large collection of wallpapers with mixed up resolutions then think no further. ImageMagick comes to your resuce to help you sort the wallpapers based on the resolutions.
According to the makers of ImageMagick :
ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PhotoCD, PNG, Postscript, SVG, and TIFF. Use ImageMagick to scale, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.
I have put together a little shell script which will help you sort you wallpaper collection according to resolution.
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