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In one of the labs performed you were to examine a .jpg and write the first 2 bytes of Hexadecimal information representing that .jpg. Which of the following is the Hexadecimal representation of that .jpg?
FF E8
FF D8
E8 FF
D8 FF
answer is FF D8
JPEG (Joint Photographic Experts Group) is a commonly used method of lossy compression for digital images, mostly for those images produced by digital photography.
The degree of compression can be adjusted, allowing a tradeoff between storage size and image quality.
JPEG compression is used in a number of image file formats.
JPEG/Exif is the most common image format used by digital cameras and other image capture devices.
JPEG/JFIF, it is the most common format for storing and transmitting photographic images on the Internet.
JPEG files (compressed images) start with an image marker which always contains the marker code hex values FF D8 FF. It does not have a length of the file embedded, thus we need to find JPEG trailer, which is FF D9.
some more information
1.JPEG files usually have a file extension of .jpg or .jpeg
2.The term "JPEG" is an acronym for the JJoint Photographic experts group which created the standard in 1992. JPEG was largely responsible for the proliferation of digital images and digital photos across the Internet, and later social media.
JPEG filename extensions
The most common file exiensions for files employing JPEG compression are .jpg and .jpeg though .jpe ,.jfif and .jif are also used. It is also possible for JPEG data to be embedded in other file types – TIFF encoded files often embed a JPEG image as a thumbnail of the main image; and MP3 files can contain a JPEG of cover art in the ID3v2 tag
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