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- WRJPGCOM(1) WRJPGCOM(1)
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- NNAAMMEE
- wrjpgcom - insert text comments into a JPEG file
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- SSYYNNOOPPSSIISS
- wwrrjjppggccoomm [ --rreeppllaaccee ] [ --ccoommmmeenntt _t_e_x_t ] [ --ccffiillee _n_a_m_e ] [
- _f_i_l_e_n_a_m_e ]
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- DDEESSCCRRIIPPTTIIOONN
- wwrrjjppggccoomm reads the named JPEG/JFIF file, or the standard
- input if no file is named, and generates a new JPEG/JFIF
- file on standard output. A comment block is added to the
- file.
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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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- wwrrjjppggccoomm adds a COM block, containing text you provide, to
- a JPEG file. Ordinarily, the COM block is added after any
- existing COM blocks; but you can delete the old COM blocks
- if you wish.
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- OOPPTTIIOONNSS
- Switch names may be abbreviated, and are not case sensi
- tive.
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- --rreeppllaaccee
- Delete any existing COM blocks from the file.
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- --ccoommmmeenntt _t_e_x_t
- Supply text for new COM block on command line.
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- --ccffiillee _n_a_m_e
- Read text for new COM block from named file.
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- If you have only one line of comment text to add, you can
- provide it on the command line with --ccoommmmeenntt. The comment
- text must be surrounded with quotes so that it is treated
- as a single argument. Longer comments can be read from a
- text file.
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- If you give neither --ccoommmmeenntt nor --ccffiillee, then wwrrjjppggccoomm
- will read the comment text from standard input. (In this
- case an input image file name MUST be supplied, so that
- the source JPEG file comes from somewhere else.) You can
- enter multiple lines, up to 64KB worth. Type an end-of-
- file indicator (usually control-D) to terminate the
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- 30 August 1994 1
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- WRJPGCOM(1) WRJPGCOM(1)
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- comment text entry.
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- wwrrjjppggccoomm will not add a COM block if the provided comment
- string is empty. Therefore --rreeppllaaccee --ccoommmmeenntt """" can be
- used to delete all COM blocks from a file.
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- EEXXAAMMPPLLEESS
- Add a short comment to in.jpg, producing out.jpg:
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- wwrrjjppggccoomm --cc _"_V_i_e_w _o_f _m_y _b_a_c_k _y_a_r_d_" _i_n_._j_p_g >> _o_u_t_._j_p_g
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- Attach a long comment previously stored in comment.txt:
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- wwrrjjppggccoomm _i_n_._j_p_g << _c_o_m_m_e_n_t_._t_x_t >> _o_u_t_._j_p_g
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- or equivalently
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- wwrrjjppggccoomm --ccffiillee _c_o_m_m_e_n_t_._t_x_t << _i_n_._j_p_g >> _o_u_t_._j_p_g
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- SSEEEE AALLSSOO
- ccjjppeegg(1), ddjjppeegg(1), rrddjjppggccoomm(1)
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- AAUUTTHHOORR
- Independent JPEG Group
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- 30 August 1994 2
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