Canon Digital Camera Catalog
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What is a CTG file?
A CTG file is an index file created by Canon digital cameras. It contains information used to organize images stored on a camera's memory card. For example, CTG files record the number of images stored in a memory card folder and the dates on which those images were taken.
You're most likely to encounter CTG files when you've connected your Canon digital camera to a computer using a USB cable. They are stored in the following directory on your camera's memory card:
CTG files are not image files; they contain no image data. Instead, they contain metadata your camera uses to organize and show photos on your camera and computer. Each CTG file corresponds to a specific image directory within your memory card. For example, the file 382.CTG contains information related to the images in the 382CANON directory.
Common CTG Filenames
382.ctg - An example CTG filename. It contains information about images in the 382CANON directory.
How to open a CTG file
You should not open, edit, or manually delete CTG files. Canon digital cameras automatically delete CTG files after the corresponding images are removed from a memory card.