CR2 is the RAW format used by Canon cameras. Also known as "digital negatives", RAW images are often preferred by photographers because they can be highly customized during the digital post-processing and they retain a large amount of image details. The disadvantage of using this format is its enormous size, which makes it difficult to store or send by email. In addition, CR2s are not compatible with many image viewing programs and are not accepted by image sharing websites.
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