Hello there. I'm looking for a quick and easy way to resize photos I took with my Android device (change their resolution). While I know to do this easily using GIMP, I'm looking to do it without changing file properties and metadata. That includes camera information, exif tags, and most importantly the date modified field.

Is there a way (either with GIMP or a console command) to change the resolution of jpg images without touching the "date modified", exif tags, and camera information?

ImageMagick might be what you're looking for.
It will resize from the command line without altering the meta-data, however you'll need to specify a new output file, which will have a different size, current time stamp etc.

ImageMagik doesn't seem to exist in my software packages (openSUSE repositories for me).

Anyway, I'm thinking about something else too, that I could use in other circumstances apart from images if needed: Maybe I could instead use a program that can import and export the metadata of files? So I may export the date modified, exif tags, camera data, etc. from any file to a text file, then after editing and saving it as a new jpg applying the old metadata to it. Does such a tool exist by default in Linux?

Well, you can use stat to get/record timestamps etc and touch to fiddle with them on a new file.
http://linux.die.net/man/1/stat
http://linux.die.net/man/1/touch

Hi,

exiv2 is a great commandline program for playing with exif metadata. One other nice feature it has is the ability to set the file modification time to whatever the timestamp is in the exif data.

Evo2.

Seems like a reasonable way to approach this would be to first dump the original image EXIF data to a file, modify the image as you want, and then dump the EXIF data from the modified image to a second file. Do a diff on the two files and figure out which EXIF fields in the modified image you need to set back to the original data. Then use an EXIF editor to reset those fields.

I just did a quick search on Google for "linux exif editor" and it came back with many hits. I followed one link to a YouTube video, http://www.youtube.com/watch?v=K9PAD7GqUag , and you can see a tutorial on how to do these type of operations using a tool named "exiftool". There were many other hits from Google that I did not pursue.

Here's a Wiki link comparing various EXIF editors. Many are for Windows, but there are some for Linux mixed in there (including the "exiftool" I mentioned above).

http://en.wikipedia.org/wiki/Compari...tadata_editors