Date: Tue, 2 Sep 2008 10:28:33 -0500 From: "Andrew Gould" <andrewlylegould@gmail.com> To: FreeBSD <freebsd@optiksecurite.com> Cc: Tom Marchand <m0rchand@comcast.net>, freebsd-questions@freebsd.org Subject: Re: How to compare 2 images from command line Message-ID: <d356c5630809020828y1e4bf347k7725857a4ceaa761@mail.gmail.com> In-Reply-To: <48BD5A8A.5080400@optiksecurite.com> References: <090220081512.17537.48BD57E100051D800000448122068246930B020E080C9DCF03@comcast.net> <48BD5A8A.5080400@optiksecurite.com>
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On Tue, Sep 2, 2008 at 10:23 AM, FreeBSD <freebsd@optiksecurite.com> wrote: > Tom Marchand a =E9crit : > >> 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 i= f 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 th= e >>> 'compare' command from imagemagick, but it produce an image containing = the >>> difference between the 2 images instead of telling me if both images ar= e >>> 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 > Yes, there's a huge difference between testing differences in images and testing differences in files. What do you mean by "...know if the display is working correctly."? Andrew
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