So there is this tool called Exiv2 that can do exactly the issue, namely cross-filetype, multi-faceted metadata editing.
Works well, has wildcard and batch processing options, but only deals with PNG. Oddly, it will show two Titles if one is inserted by ImageMagick or ExifTool.
Like Inkscape, PNGCommentator actually implements things correctly. Not to mention the university site hosting Exiftool is down. Turns out that Exiftool sucks equally as bad. If the metadata is originally created by Inkscape, it can edit it in a way that preserves. Can read and write all metadata, but does it in a way that OSX Preview will ignore/overwrite. Turn off remove metadata options to preserve metadata. Too bad this doesn't work, that is it cannot edit metadata in JPG files. Unfortunately GIMP won't keep metadata in the XCF native GIMP file. Partha's McGimp variants, the McGimp 2.9.5 64-bit Experimental, or McGimp 2.9.5 64-bit Color Corrected Experimental, are based on 2.9.4 (and are interesting projects in their own right, with HDR extensions and plugins). Note that these are the experimental/unstable releases (stable releases are every few years, so if you want this functionality, have to live on the edge a bit). It is under the menu > Image > Image Metadata. EXIF, XMP metadata editor/viewer added as of Gimp 2.9.4 (possibly 2.9.2). File > Document Metadata provides a nice Dublin Core interface. Don't use this or it will corrupt the file. Somewhat awkward XML editor for SVG metadata. This is because Inkscape puts the info in front of IDAT, but the others do not. 1 However, if the metadata is written by Inkscape in an SVG file and then exported as PNG, it will read it correctly. 
Will blank overwrite PNG metadata added by ImageMagick or Exiftool.Image Editors and Metadata BehaviorĬurrently, the most convenient tools (aka, the ones I use), and their status on JPG Exif and PNG metadata (XMP): OSX Preview In SVG this is a Dublin Core standard, and in PNG the same is generally available. When looking at a file with a tool, generally a few different bits and bobs are present. For JPG there is EXIF, but for PNG or SVG there are other standards, as in PNG does not have EXIF. Turns out there is more than one way to stuff a keyword. Generally things start with or result in various formats, including: It would be best if metadata could be added, modified at each stage of editing, and by default would be preserved on copy, export, format changes, compression, etc.
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