Bill Moran a écrit :
In response to FreeBSD <[EMAIL PROTECTED]>:
Andrew Gould a écrit :
I want to determine if Mplayer is working correctly. The best way to be
sure is to check if the display on the screen is changing. That's the
purpose of the screenshots. The screenshots are taken by Nagios every 5
minutes and the new screenshot is compared with the preceding one. But,
by now, it doesn't work because every tool we try is seeing a diffence
between 2 identical images.
On Tue, Sep 2, 2008 at 10:23 AM, FreeBSD <[EMAIL PROTECTED]
<mailto:[EMAIL PROTECTED]>> wrote:
Tom Marchand a écrit :
Hash the images and compare the hashes.
-------------- Original message ----------------------
From: FreeBSD <[EMAIL PROTECTED]
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.
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."?
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.
Thanks everyone for your support.
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