The JPEG markers contain SOFn for start of frame and SOS for start of scan. What do the two items mean and what is the connectio between them?
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In the JPEG modes that are actually used in the real world——
A Frame is the image. The SOFn market describes the format of the image.
A Scan is a single pass through the image data. In a grayscale image processed sequentially, there will be one scan in the frame.
In a color frames processed sequentially and noninterleaved, there will be three scans in the frame, one for each color component.
In a progressive JPEG frame, there can be a multitude of scans in a frame.
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