Obscura Flow articles on cataloging, photographic archiving, documentation, and preservation.https://obscuraflow.appen-UShttps://obscuraflow.app/en/blog/chaine-de-preservationhttps://obscuraflow.app/en/blog/chaine-de-preservationSix stages, from memory card to periodic verification. What makes it a chain rather than a set of good intentions.Sun, 26 Jul 2026 00:00:00 GMTPreservationpreservation workflowprocessarchivinghttps://obscuraflow.app/en/blog/champs-iptc-archiveshttps://obscuraflow.app/en/blog/champs-iptc-archivesThe standard has dozens of fields. The eight that make the difference, and the order to fill them in.Sun, 26 Jul 2026 00:00:00 GMTMetadataIPTCmetadataarchivinghttps://obscuraflow.app/en/blog/convention-de-tagshttps://obscuraflow.app/en/blog/convention-de-tagsA 300-keyword collection is unmanageable; a 30-keyword one works. The rules that stop a tag list from drifting.Sun, 26 Jul 2026 00:00:00 GMTMetadatatagsvocabularyorganizationhttps://obscuraflow.app/en/blog/creer-un-catalogue-raisonnehttps://obscuraflow.app/en/blog/creer-un-catalogue-raisonneThe scholarly inventory of a body of work: what it holds, how to structure it, and the distinctions you cannot skip.Sun, 26 Jul 2026 00:00:00 GMTMethodcatalogue raisonnéheritagedocumentationhttps://obscuraflow.app/en/blog/dam-photographiehttps://obscuraflow.app/en/blog/dam-photographieThe acronym covers wildly different tools. What a DAM actually adds, and the signals that tell you the question is real.Sun, 26 Jul 2026 00:00:00 GMTOrganizationDAMcatalogorganizationhttps://obscuraflow.app/en/blog/deduplication-imageshttps://obscuraflow.app/en/blog/deduplication-imagesExact duplicate, near-duplicate, version: three different situations wrongly treated the same way. How to tell them apart before deleting.Sun, 26 Jul 2026 00:00:00 GMTOrganizationduplicatesdeduplicationorganizationhttps://obscuraflow.app/en/blog/dublin-core-collections-photohttps://obscuraflow.app/en/blog/dublin-core-collections-photoFifteen simple elements, designed to be understood by any system. What Dublin Core brings to a photo collection, and where it stops.Sun, 26 Jul 2026 00:00:00 GMTMetadataDublin Corestandardsinteroperabilityhttps://obscuraflow.app/en/blog/ecrire-dans-originaux-ou-sidecarhttps://obscuraflow.app/en/blog/ecrire-dans-originaux-ou-sidecarA trade-off between the risk of touching the original and the risk of losing a companion file. The answer depends on the format.Sun, 26 Jul 2026 00:00:00 GMTMetadataXMPsidecarmetadatahttps://obscuraflow.app/en/blog/ed25519-sha256-archiveshttps://obscuraflow.app/en/blog/ed25519-sha256-archivesOne detects a change, the other proves an origin. Two tools often conflated, with very different guarantees.Sun, 26 Jul 2026 00:00:00 GMTPreservationSHA-256Ed25519integrityhttps://obscuraflow.app/en/blog/fichier-sidecar-xmphttps://obscuraflow.app/en/blog/fichier-sidecar-xmpThe small .xmp file sitting next to your RAW, what it holds, and the two rules that stop you losing work through it.Sun, 26 Jul 2026 00:00:00 GMTMetadataXMPsidecarmetadatahttps://obscuraflow.app/en/blog/fixite-preservation-numeriquehttps://obscuraflow.app/en/blog/fixite-preservation-numeriqueFixity is the property that lets you state a file hasn't changed. How it's established, and why a backup doesn't guarantee it.Sun, 26 Jul 2026 00:00:00 GMTPreservationfixityintegritychecksumhttps://obscuraflow.app/en/blog/gerer-la-provenancehttps://obscuraflow.app/en/blog/gerer-la-provenanceBuilding a chain, arbitrating contradictory sources, documenting a gap. The real work, after the theory.Sun, 26 Jul 2026 00:00:00 GMTMethodprovenancesourcesheritagehttps://obscuraflow.app/en/blog/inventaire-perennehttps://obscuraflow.app/en/blog/inventaire-perenneAn inventory number that survives renames, reorganisations, and a change of software. The rules that make it last.Sun, 26 Jul 2026 00:00:00 GMTOrganizationinventoryidentifiersdurabilityhttps://obscuraflow.app/en/blog/manifeste-archive-photohttps://obscuraflow.app/en/blog/manifeste-archive-photoThe file that describes a deposit's contents and lets you prove its integrity. What it must contain to be useful in ten years.Sun, 26 Jul 2026 00:00:00 GMTPreservationmanifestarchivingintegrityhttps://obscuraflow.app/en/blog/nas-ou-s3https://obscuraflow.app/en/blog/nas-ou-s3The two aren't really opposed. What each covers, what neither covers alone, and how to decide based on your volume.Sun, 26 Jul 2026 00:00:00 GMTPreservationNASobject storagebackuphttps://obscuraflow.app/en/blog/normalisation-metadonneeshttps://obscuraflow.app/en/blog/normalisation-metadonneesThree spellings of one place name are three different places to a machine. How to bring a heterogeneous collection back to a coherent vocabulary.Sun, 26 Jul 2026 00:00:00 GMTMetadatanormalizationmetadataqualityhttps://obscuraflow.app/en/blog/photographie-nativement-numeriquehttps://obscuraflow.app/en/blog/photographie-nativement-numeriqueAn image born digital has no physical fallback. What that changes for preservation, and the three risks specific to it.Sun, 26 Jul 2026 00:00:00 GMTPreservationborn-digitalpreservationformatshttps://obscuraflow.app/en/blog/planche-contact-numeriquehttps://obscuraflow.app/en/blog/planche-contact-numeriqueThe object is gone, the function isn't. What the contact sheet actually provided, and how to get it back digitally.Sun, 26 Jul 2026 00:00:00 GMTOrganizationcontact sheetcurationdocumentationhttps://obscuraflow.app/en/blog/provenance-archives-photographiqueshttps://obscuraflow.app/en/blog/provenance-archives-photographiquesThe documented chain of hands a work has passed through. What it establishes, how to record it, and why it's rarely publishable as-is.Sun, 26 Jul 2026 00:00:00 GMTMethodprovenanceheritagedocumentationhttps://obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-lightroomhttps://obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-lightroomThe .lrcat file isn't your photos, it's everything you decided about them. What it stores, and why it deserves particular care.Sun, 26 Jul 2026 00:00:00 GMTMigrationLightroomcatalogmigrationhttps://obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-photohttps://obscuraflow.app/en/blog/qu-est-ce-qu-un-catalogue-photoA catalog describes your images without moving them. What it holds, what it enables, and the trap of letting it become the only place your work exists.Sun, 26 Jul 2026 00:00:00 GMTOrganizationcatalogorganizationmetadatahttps://obscuraflow.app/en/blog/qu-est-ce-que-archivage-photohttps://obscuraflow.app/en/blog/qu-est-ce-que-archivage-photoA backup protects you from the last incident. An archive keeps a body of work usable in twenty years. They solve different problems.Sun, 26 Jul 2026 00:00:00 GMTPreservationarchivingpreservationlong termhttps://obscuraflow.app/en/blog/retrouver-une-photohttps://obscuraflow.app/en/blog/retrouver-une-photoPast a certain volume, scrolling stops working. The four handles that make a large collection genuinely searchable.Sun, 26 Jul 2026 00:00:00 GMTOrganizationsearchorganizationmetadatahttps://obscuraflow.app/en/blog/sauvegarde-hors-sitehttps://obscuraflow.app/en/blog/sauvegarde-hors-siteTwo drives in one drawer are a single target. What qualifies a copy as off-site, and the realistic options for a photographer.Sun, 26 Jul 2026 00:00:00 GMTPreservationoff-sitebackup3-2-1https://obscuraflow.app/en/blog/sauvegarde-locale-ou-cloudhttps://obscuraflow.app/en/blog/sauvegarde-locale-ou-cloudThey protect against different risks. Why one doesn't replace the other, and how to split without paying twice.Sun, 26 Jul 2026 00:00:00 GMTPreservationbackupcloudlocalhttps://obscuraflow.app/en/blog/sauvegarder-sur-amazon-s3https://obscuraflow.app/en/blog/sauvegarder-sur-amazon-s3The object storage reference, with its storage classes, egress costs, and the settings that decide everything else.Sun, 26 Jul 2026 00:00:00 GMTPreservationS3object storageoff-sitehttps://obscuraflow.app/en/blog/sauvegarder-sur-backblaze-b2https://obscuraflow.app/en/blog/sauvegarder-sur-backblaze-b2Object storage positioned on price and a readable bill, S3-compatible. What it does well, and what to check.Sun, 26 Jul 2026 00:00:00 GMTPreservationBackblaze B2object storageoff-sitehttps://obscuraflow.app/en/blog/sauvegarder-sur-cloudflare-r2https://obscuraflow.app/en/blog/sauvegarder-sur-cloudflare-r2S3-compatible object storage with no outbound transfer fees. What that changes for a photo archive, and the trade-offs.Sun, 26 Jul 2026 00:00:00 GMTPreservationCloudflare R2object storageoff-sitehttps://obscuraflow.app/en/blog/sauvegarder-sur-nas-versionshttps://obscuraflow.app/en/blog/sauvegarder-sur-nas-versionsA NAS quickly accumulates three copies of the same folder with no one knowing which is authoritative. How to keep a usable record.Sun, 26 Jul 2026 00:00:00 GMTPreservationNASversionsbackuphttps://obscuraflow.app/en/blog/verifier-integrite-archivehttps://obscuraflow.app/en/blog/verifier-integrite-archiveRunning a verification campaign, choosing between sampling and exhaustive checks, and the decision tree when a checksum no longer matches.Sun, 26 Jul 2026 00:00:00 GMTPreservationintegrityverificationaudithttps://obscuraflow.app/en/blog/sauvegarde-3-2-1https://obscuraflow.app/en/blog/sauvegarde-3-2-1An external drive, even duplicated, is rarely a real backup strategy. What the 3-2-1 rule actually means for your photos.Fri, 24 Jul 2026 00:00:00 GMTPreservationbackup3-2-1offsitehttps://obscuraflow.app/en/blog/tester-une-restaurationhttps://obscuraflow.app/en/blog/tester-une-restaurationA file or archive being present doesn't guarantee it can be restored. Why you should test a restore before you need it.Thu, 23 Jul 2026 00:00:00 GMTPreservationrestoreintegrityarchiveshttps://obscuraflow.app/en/blog/organiser-une-photothequehttps://obscuraflow.app/en/blog/organiser-une-photothequeA step-by-step approach to reclaiming an old, scattered photo collection, without trying to reclassify everything at once.Wed, 22 Jul 2026 00:00:00 GMTOrganizationinventoryduplicatesprojectshttps://obscuraflow.app/en/blog/projet-collection-seriehttps://obscuraflow.app/en/blog/projet-collection-serieThe physical structure of your files doesn't have to mirror the intellectual structure of your work.Tue, 21 Jul 2026 00:00:00 GMTOrganizationprojectscollectionsserieshttps://obscuraflow.app/en/blog/nommer-ses-fichiershttps://obscuraflow.app/en/blog/nommer-ses-fichiersThe limits of DSC_4827.NEF, and of overly complex naming conventions. How to give a photo a stable identity instead.Sat, 18 Jul 2026 00:00:00 GMTOrganizationfile naminginventory numberversionshttps://obscuraflow.app/en/blog/exif-iptc-xmphttps://obscuraflow.app/en/blog/exif-iptc-xmpWho keeps what? A clear, lasting reference on the three families of photo metadata, and what gets lost in migration.Fri, 17 Jul 2026 00:00:00 GMTMetadataEXIFIPTCXMPhttps://obscuraflow.app/en/blog/metadonnees-minimales-seriehttps://obscuraflow.app/en/blog/metadonnees-minimales-serieA directly usable checklist of the fields that separate a documented series from a batch of orphan images.Thu, 16 Jul 2026 00:00:00 GMTMetadatadocumentationIPTCserieshttps://obscuraflow.app/en/blog/vocabulaire-controle-thesaurushttps://obscuraflow.app/en/blog/vocabulaire-controle-thesaurusBuild a controlled vocabulary without becoming an archivist, and without drowning your photo library in inconsistent keywords.Wed, 15 Jul 2026 00:00:00 GMTMetadatathesauruskeywordscontrolled vocabularyhttps://obscuraflow.app/en/blog/migrer-lightroom-ce-qui-est-conservehttps://obscuraflow.app/en/blog/migrer-lightroom-ce-qui-est-conserveElement by element, what can really be brought over from a Lightroom catalog, and where the limits are.Sat, 11 Jul 2026 00:00:00 GMTMigrationLightroomcurationcollectionshttps://obscuraflow.app/en/blog/raw-jpeg-tiff-conserverhttps://obscuraflow.app/en/blog/raw-jpeg-tiff-conserverRAW, JPEG, TIFF, exports, sidecars, a nuanced answer to a real photographer's question, with a decision matrix.Fri, 10 Jul 2026 00:00:00 GMTFormatsRAWTIFFderivativeshttps://obscuraflow.app/en/blog/detecter-fichier-corrompuhttps://obscuraflow.app/en/blog/detecter-fichier-corrompuSilent corruption, checksums, format validation, and fixity audits, explained without jargon.Thu, 09 Jul 2026 00:00:00 GMTPreservationcorruptionchecksumfixityhttps://obscuraflow.app/en/blog/local-first-maitrise-archivehttps://obscuraflow.app/en/blog/local-first-maitrise-archiveWhy your originals shouldn't depend on an online service, and where the cloud still has its place.Wed, 08 Jul 2026 00:00:00 GMTPhilosophylocal-firstcloudon-device AIhttps://obscuraflow.app/en/blog/migration-lightroomhttps://obscuraflow.app/en/blog/migration-lightroomHow to preserve ratings, keywords, collections, virtual copies, and develop history.Fri, 03 Jul 2026 00:00:00 GMTMigrationLightroommigrationcataloghttps://obscuraflow.app/en/blog/documenter-une-seriehttps://obscuraflow.app/en/blog/documenter-une-serieA method for keeping authorship, intent, location, rights, and relationships readable.Thu, 02 Jul 2026 00:00:00 GMTMethoddocumentationseriesmetadatahttps://obscuraflow.app/en/blog/archive-photographiquehttps://obscuraflow.app/en/blog/archive-photographiqueA practical approach to inventories, checksums, signatures, copies, and restore.Wed, 01 Jul 2026 00:00:00 GMTPreservationarchiveintegritybackup