Many XMP files have counterparts in EXIF (like date and time) IPTC (like title or description) or GPS. This is why IMatch (with the help of ExifTool) produces a rich XMP metadata record when it ingests a file - by importing EXIF, IPTC and GPS data from the image into the XMP metadata record IMatch maintains for each file.ĭuring write-back, IMatch not only writes the modified XMP data (like a rating, title, description, date and time.) but also maps this data back into the (when in the file) EXIF, IPTC and GPS records. It can contain everything that is in EXIF, IPTC and GPS, and lots lots more. And neither is the naming scheme for XMP sidecar files.Īll XMP-aware application must stick to the rules. Note that the RAW may still contain EXIF, IPTC and GPS data - if set by the camera. JPG, PNG, TIFF, PSD, PSB, DNG, GIF, PDF and some others use embedded XMP data - in the image file itself.įor RAW formats or other file formats which don't support embedded XMP, XMP metdata must be stored in the associated XMP sidecar file. Where the metadata is stored is indeed specified and supported (less or more) by all standard applications in the imaging and video field. I can only recommend again the extensive information about metadata and storage in the IMatch help: Metadata Storage It even has pictures Or even RawTherapee users, as I think the same situation applies. Can I set iMatch to write this extra metadata (especially keywords) into the image file, after it has been created (by export) by DT ?Īgain, I would welcome feedback from DarkTable users. xmp sidecar (which DT ignores) and NOT into the. However, my understanding is that iMatch will write this data to the associated. If you use an external DAM, you'll need for it to independently write the metadata into the JPG, not only to a sidecar file."īearing in mind that it is generally acknowledged that DT makes limited use of metadata, I expect to add a significant amount of metadata via iMatch. ".DT exports to the JPG only the metadata it knows of. I have just read this comment, which is a part of a response to a question I posed to the DarkTable users list: Sorry to keep on asking questions about this topic (the implications of managing metadata added by both iMatch and another programme, such as DarkTable), but at this stage of my learning my ignorance far exceeds my understanding. Each RAW processor has its strengths, and not all RAW processors work well with all RAW formats or shooting conditions. Depending on your workflow and demands of course. This ensures rich and standard-compliant metadata.įor image editing, DT is surely an alternative for some other other RAW processors. I would be really careful not to add or edit metadata in DT. See the post from bekesizl above (our posts crossed). This is what all standard applications in the imaging market expect. which must use embedded XMP as per XMP and industry standards.ĭT uses file names like _ instead of the standardized _DSC123456.xmp (XMP files must have the same name as the linked image, but the extension. It even produces sidecar files for image formats like JPEG/TIFF/. It also uses a proprietary file naming scheme that is not covered by the XMP standard, which makes the sidecar files it uses invisible / unusable in other applications.Īctually, if you have RAW files with an XMP sidecar file already, it produces another XMP sidecar file, with only a small portion of the original metadata. No migration between legacy IPTC/EXIF/GPS. If memory servers it supports only a small subset of XMP. But I've checked it out last year to see if and which image metadata it supports - and I was not impressed. I have never actually worked (processed image files) with DT. Which are basically all professional and commercial products, ExifTool, many open source projects. This makes you independent from IMatch and allows you to see and work with your metadata in all other applications that also support XMP. In a standardized and widely supported format. The IMatch database servers as a powerful cache and aggregator - but your precious metadata is stored where it belongs: in your image files. That IMatch is so good at working with XMP is actually a massive benefit for you.īecause it means that your metadata is stored inside your images, not only in the IMatch database. XMP is also a superset of the older standard IIM3 IPTC, EXIF and GPS and the Metadata Working Group defined rules for how older metadata has to be migrated into XMP, and back. XMP is the industry standard for storing metadata in image and other files (or as separate XMP files in case of RAW and other files).
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