2.2. Understanding File Formats
The character code extension that follows the name of the file lets the Mac Operating System look in Launch Services to see whether an association has been made for that file extension, or file type. iPhoto supports photos that have been saved in a wide range of file formats such as JPEG, TIFF, RAW, PSD, and more.
JPEG
You will sometimes see this file format listed as JPEG or JPG. JPEG is the most common file format digital cameras use. A digital camera creates a JPEG file by processing and compressing the data received from the image sensor. The compression which occurs in the creation of a JPEG file can create ...
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