If new thumbnails are subsequently added, old thumbnails are dropped from the cache. This program will generate all missing thumbnails in one go.Īs the thumbnail cache has a pre-defined maximum size it will eventually get filled up. Alternatively you may terminate darktable and generate the thumbnail cache separately by running darktable-generate-cache. When importing a large set of new images, thumbnail generation can slow down navigation in the lighttable view. You will notice the difference as soon as you open the image in the darkroom mode, at which point darktable replaces the thumbnail with its own internally processed version.Īfter import darktable automatically generates thumbnails for new images as they are needed. However, these thumbnails have been generated by the raw converter of the camera and do not represent darktable’s “view” of that image. You can define how darktable obtains its thumbnails in preferences > lighttable > thumbnails.Įxtracting an embedded thumbnail from the input image is usually very fast. When an image is imported for the first time darktable can either try to extract an embedded thumbnail from the input image (most raw files contain these, usually in JPEG format) or process the raw image itself using default settings. ?thumbnail creationĪ thumbnail is created when an image is imported into darktable for the first time, after an image has been modified in the darkroom, or when revisiting an image whose thumbnail is no longer available.
The size of this cache can be adjusted in preferences > processing > cpu/gpu/memory. A cache of the most recently used thumbnails is stored in a file on disk and loaded into memory at startup. Each image in the current collection is represented by a thumbnail in the lighttable view and filmstrip module.