[kwlug-disc] Image Comparison
kb at 2bits.com
Tue Aug 11 23:35:41 EDT 2009
There is a jhead program, forgot which package installs that.
It extracts the EXIF data from any file that has EXIF.
# jhead ./large-flower/dscf4095.jpg
File name : ./large-flower/dscf4095.jpg
File size : 900105 bytes
File date : 2009:05:31 16:23:52
Camera make : FUJIFILM
Camera model : FinePix S5100
Date/Time : 2009:05:31 16:23:51
Resolution : 2272 x 1704
Flash used : No
Focal length : 7.5mm (35mm equivalent: 51mm)
CCD width : 5.34mm
Exposure time: 0.0042 s (1/240)
Aperture : f/2.9
ISO equiv. : 400
Whitebalance : Manual
Metering Mode: matrix
Exposure : program (auto)
You can run that through grep and extract whichever fields make sense to
On Tue, Aug 11, 2009 at 10:51 PM, Chris Frey <cdfrey at foursquare.net> wrote:
> On Tue, Aug 11, 2009 at 10:12:04PM -0400, L.D. Paniak wrote:
> > Is the EXIF data compressed with the image or just a header floating on
> > top? Could one just compare the tails of the files?
> > for file in *; do echo "$(tail $file |md5sum) $file" >>tmp; done
> > sort tmp
> According to a quick scan of wikipedia, looks like the EXIF header is
> at the beginning of the file. Looking at some sample files from my
> camera, the information is not compressed.
> So looks like tail would work too, as long as the end doesn't contain
> the same data across multiple pictures. I don't know if things like
> colour profiles are stored at the end or not.
> - Chris
> kwlug-disc_kwlug.org mailing list
> kwlug-disc_kwlug.org at kwlug.org
Khalid M. Baheyeldin
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