Date: Tue, 02 Sep 2008 12:21:35 -0400 From: FreeBSD <freebsd@optiksecurite.com> To: andrew clarke <mail@ozzmosis.com> Cc: freebsd-questions@freebsd.org Subject: Re: How to compare 2 images from command line Message-ID: <48BD680F.2020102@optiksecurite.com> In-Reply-To: <20080902161755.GA99236@ozzmosis.com> References: <090220081512.17537.48BD57E100051D800000448122068246930B020E080C9DCF03@comcast.net> <48BD5A8A.5080400@optiksecurite.com> <d356c5630809020828y1e4bf347k7725857a4ceaa761@mail.gmail.com> <48BD5C65.9030502@optiksecurite.com> <20080902114639.f06b082a.wmoran@potentialtech.com> <48BD626F.6000401@optiksecurite.com> <20080902161755.GA99236@ozzmosis.com>
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andrew clarke a écrit : > On Tue 2008-09-02 11:57:35 UTC-0400, FreeBSD (freebsd@optiksecurite.com) wrote: > >>> Can you put the screenshots into some other format? As you mentioned, >>> the jpeg format includes metadata, which might include the creation >>> time and would cause every image to be unique from a filesystem view. >>> For example, I don't believe bitmaps include metadata, which would cause >>> them to be identical if the display were identical. >> Thank you! It did the trick. I just converted the image from png (sorry >> it wasn't jpeg...) to bmp and it works with cmp. Even diff now recognize >> both images as identical. > > Before I read this I was going to suggest you could try removing the > metadata using something like jhead. As it turns out, you say you're > using PNG format images, not JPEGs, but perhaps there's an equivalent > to jhead to work with metadata in PNG files - just as an > alternative to converting each PNG to BMP (which could be CPU intensive). > > Regards > Andrew Thank you for your "almost-suggestion" ;) The screenshot are taken once every 5 minutes and the conversion was pretty instant. I don't think it will be a problem in our case. Martin
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