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info:jpg_headers_explained [2009/04/23 14:55] – tomgeeinfo:jpg_headers_explained [2009/04/23 14:55] (current) – tomgee
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 Digital Cameras save images in JFIF (usually incorrectly called JPEG or if you're an MS-DOS user JPG) format. Anyway, "JPEG" files consist of "markers" which separate out each part of the file. For example, every JPEG starts with a "start of image" marker and stop with an "end of image" marker. Most markers are followed by 2 bytes which tell the number of bytes that fit in the frame that was marked with this marker. After that the data follows. So what markers are in a typeical JPEG? These markers should exist in all JPEG files: Digital Cameras save images in JFIF (usually incorrectly called JPEG or if you're an MS-DOS user JPG) format. Anyway, "JPEG" files consist of "markers" which separate out each part of the file. For example, every JPEG starts with a "start of image" marker and stop with an "end of image" marker. Most markers are followed by 2 bytes which tell the number of bytes that fit in the frame that was marked with this marker. After that the data follows. So what markers are in a typeical JPEG? These markers should exist in all JPEG files:
-  * Unordered List Item 
  
   * 0xffd8 - Start Of Image   * 0xffd8 - Start Of Image
info/jpg_headers_explained.1240512941.txt.gz · Last modified: 2009/04/23 14:55 by tomgee