Follow Following links:
http://binodjava.blogspot.in/2009/06/how-to-compare-two-images-check-two.html
comparing images by ImageMagick apllication, can be downloaded from http://www.imagemagick.org/script/binary-releases.php
ImageMagick apllication is command-line application, therefore command for comparing two images are describe in below links
http://www.imagemagick.org/Usage/compare/
http://www.imagemagick.org/script/compare.php
you can do other stuff also with Images in this software like curving corner of image:
http://www.ibm.com/developerworks/library/l-graf2/?ca=dgr-lnxw15GraphicsLine
http://www.ibm.com/developerworks/library/l-graf/?ca=dnt-428
Look into other software also like Geeqie (http://www.freesoftwaremagazine.com/articles/compare_two_images_easily_geeqie), and another one xnview
http://binodjava.blogspot.in/2009/06/how-to-compare-two-images-check-two.html
comparing images by ImageMagick apllication, can be downloaded from http://www.imagemagick.org/script/binary-releases.php
ImageMagick apllication is command-line application, therefore command for comparing two images are describe in below links
http://www.imagemagick.org/Usage/compare/
http://www.imagemagick.org/script/compare.php
you can do other stuff also with Images in this software like curving corner of image:
http://www.ibm.com/developerworks/library/l-graf2/?ca=dgr-lnxw15GraphicsLine
http://www.ibm.com/developerworks/library/l-graf/?ca=dnt-428
Look into other software also like Geeqie (http://www.freesoftwaremagazine.com/articles/compare_two_images_easily_geeqie), and another one xnview