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The Indispensable Guide to Lightroom CC by Sean McCormack

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1 Library Basics

Lightroom is a modular workflow application that uses a database (called the Catalog) to store information (both metadata and editing settings) about your images. During the image-ingestion process, Lightroom reads the information for each file and stores this information in the Catalog. The photos and videos are still on disk, located either where you originally had them or wherever you tell Lightroom to put them during ingestion. They don’t reside in the Catalog; they’re just referenced from it. Once an image is ingested into Lightroom, you have the option to work with your photos offline; that is, with the image drive disconnected. ...

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