On Wed, January 21, 2009 05:38, Cristian RodrÃguez wrote:
Felix Miata escribió:
The differences in md5sum mainly prove the images are different, not necessarily the page, but the difference between your screenshots is too obvious for md5sums to matter.
Sure, but this is computer science ;) you need a verfication method to know if what your eyes are seeing is true or not, visual perceptions can vary widely and better not to mention the fact browsers, webservers and image processing libraries may have a number of nasty bugs.
If you take two screenshots of a browser window with the address bar visible, in each case with a different url, then of course the image files will be different. That's only logical. Also if you save to a file format that saves the modification date+time in some metadata like EXIF, then your md5sum will be different too. Use GOOD computer science, not computer scientology. :p To compare images, you could use imgcmp: $ imgcmp -f 3111skyline-nemesis.jpg -F 3111skyline-ecstasy.jpg -m rmse 71.544772 71.371629 68.839902 Above zero values means that the images are different. You could also use The Gimp: * load the first image * paste the second image as a the new layer * set layer mode to difference or subtraction. If you get a perfectly pitch black result, then they are identical. Anything else is the difference between the two. In case you see a very dark grey noise, then your images are probably almost identical and the difference can be attributed to a different lossy compression quality. See http://www.flickr.com/photos/25187958@N03/tags/opensuse/ for my results on visually comparing the two screenshots. -- Amedee -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org