Date: Tue, 02 Sep 2008 11:23:54 -0400 From: FreeBSD <freebsd@optiksecurite.com> To: Tom Marchand <m0rchand@comcast.net> Cc: freebsd-questions@freebsd.org Subject: Re: How to compare 2 images from command line Message-ID: <48BD5A8A.5080400@optiksecurite.com> In-Reply-To: <090220081512.17537.48BD57E100051D800000448122068246930B020E080C9DCF03@comcast.net> References: <090220081512.17537.48BD57E100051D800000448122068246930B020E080C9DCF03@comcast.net>
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Tom Marchand a écrit : > Hash the images and compare the hashes. > > -------------- Original message ---------------------- > From: FreeBSD <freebsd@optiksecurite.com> >> Hi everyone, >> >> I'm trying to determine if 2 jpeg images are identical. The images are >> screenshots taken with scrot at different times. The point is to know if >> the display is working correctly. I tried to use 'diff' but without >> success, probably because of the metadata included in the image. I also >> tried the 'compare' command from imagemagick, but it produce an image >> containing the difference between the 2 images instead of telling me if >> both images are identical. >> >> So, my question is what are you using to determine if 2 images are >> identical? >> >> I'm using FreeBSD 7.0 and I need to be able to script this comparaison >> for an integration in Nagios. >> >> Thank you, >> >> Martin I just tried it and it doesn't work. The hashes are different. I can't say that I'm surprised since 'diff' is "seeing" a difference between the two identical images. Thanks for the suggestion
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