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- RDJPGCOM(1) RDJPGCOM(1)
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- NNAAMMEE
- rdjpgcom - display text comments from a JPEG file
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- SSYYNNOOPPSSIISS
- rrddjjppggccoomm [ --vveerrbboossee ] [ _f_i_l_e_n_a_m_e ]
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- DDEESSCCRRIIPPTTIIOONN
- rrddjjppggccoomm reads the named JPEG/JFIF file, or the standard
- input if no file is named, and prints any text comments
- found in the file on the standard output.
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- The JPEG standard allows "comment" (COM) blocks to occur
- within a JPEG file. Although the standard doesn't actu
- ally define what COM blocks are for, they are widely used
- to hold user-supplied text strings. This lets you add
- annotations, titles, index terms, etc to your JPEG files,
- and later retrieve them as text. COM blocks do not inter
- fere with the image stored in the JPEG file. The maximum
- size of a COM block is 64K, but you can have as many of
- them as you like in one JPEG file.
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- OOPPTTIIOONNSS
- --vveerrbboossee
- Causes rrddjjppggccoomm to also display the JPEG image
- dimensions.
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- Switch names may be abbreviated, and are not case sensi
- tive.
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- HHIINNTTSS
- rrddjjppggccoomm does not depend on the IJG JPEG library. Its
- source code is intended as an illustration of the minimum
- amount of code required to parse a JPEG file header cor
- rectly.
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- SSEEEE AALLSSOO
- ccjjppeegg(1), ddjjppeegg(1), wwrrjjppggccoomm(1)
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- AAUUTTHHOORR
- Independent JPEG Group
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- 8 July 1994 1
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