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I am using Coldfusion to view images stored in the file system and I can READ the EXIF metadata of JPEGs, but I'd like to know if it is possible to modify this information and re-save the image.
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Paid standard programs such as Adobe Lightroom (Mac and Windows), Apple Photos (Mac) and Aperture (Mac) can help you edit the meta information. The free software GIMP now also supports the modification of Exif information. You can access the image metadata simply by opening an image or photo from the Image tab.
EXIF key-value pairs are called tags, and each tag can contain either a string or numeric value. There are dozens of tags in the current EXIF standard (version 2.32), and anyone — from smartphone and camera manufacturers to photographers — is free to add their own.
Viewing EXIF data in Windows is easy. Just right-click on the photo in question and select “Properties”. Click on the “Details” tab and scroll down—you'll see all kinds of information about the camera used, and the settings the photo was taken with.
According to XMP Specification, an XMP packet is embedded in a PNG graphic file by adding a chunk of type iTXt with the keyword 'XML:com. adobe. xmp'. There are no standard for Exif, IPTC data.
I know that there are XMP and IPTC custom tags out there, I googled now and seems that javaloader.cfc + some java lib are your only sure option.
EDIT: Since I work on stock photography application I got interested and found this command line tool which could do the trick:
http://www.sno.phy.queensu.ca/~phil/exiftool/
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