| 1 | .\"------------------------------------------------------------
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| 2 | .\" Id - set Rv,revision, and Dt, Date using rcs-Id tag.
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| 3 | .de Id
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| 4 | .ds Rv \\$3
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| 5 | .ds Dt \\$4
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| 6 | ..
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| 7 | .Id $Id: mgtic.1 16583 2008-07-29 10:20:36Z davidb $
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| 8 | .\"------------------------------------------------------------
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| 9 | .TH mgtic 1 \*(Dt CITRI
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| 10 | .SH NAME
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| 11 | mgtic \- textual image compression.
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| 12 | .SH SYNOPSIS
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| 13 | .B mgtic
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| 14 | .B \-e
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| 15 | [
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| 16 | .B \-L
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| 17 | ]
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| 18 | [
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| 19 | .B \-Q
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| 20 | ]
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| 21 | [
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| 22 | .B \-X
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| 23 | ]
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| 24 | .I libraryfile
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| 25 | .I infile
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| 26 | .if n .ti +9n
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| 27 | [
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| 28 | .I \>compressed\-outfile
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| 29 | ]
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| 30 | .nf
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| 31 | or
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| 32 | .fi
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| 33 | .B mgtic
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| 34 | .B \-d
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| 35 | [
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| 36 | .B \-L
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| 37 | ]
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| 38 | [
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| 39 | .BI \-X " libraryfile"
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| 40 | ]
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| 41 | .I compressed-infile
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| 42 | .if n .ti +9n
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| 43 | [
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| 44 | .I \>outfile
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| 45 | ]
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| 46 | .SH DESCRIPTION
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| 47 | This is the main routine in the
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| 48 | .B mgtic
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| 49 | system.
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| 50 | .B mgtic
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| 51 | is used to
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| 52 | processes a series of files, and by using the
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| 53 | .I libraryfile
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| 54 | produced by
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| 55 | .BR mgticbuild (1),
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| 56 | compresses input files with respect to the marks contained in the
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| 57 | library. On the CCITT test faxes, lossless mode achieved around 20:1
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| 58 | compression, and lossy, around 40:1 compression. On more textual
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| 59 | images, the amount of compression is determined by the resolution of
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| 60 | the original file, and the amount of noise in the image. By default,
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| 61 | .B mgtic
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| 62 | will reconstruct a lossy version of the image. This
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| 63 | can be changed to lossless by using the
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| 64 | .B \-L
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| 65 | option.
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| 66 | .SH OPTIONS
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| 67 | Options may appear in any order, but must come before the input
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| 68 | filenames.
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| 69 | .TP "\w'\fB\-X\fP \fI[libraryfile]\fP'u+2n"
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| 70 | .B \-h
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| 71 | This displays a usage line on
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| 72 | .IR stderr .
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| 73 | .TP
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| 74 | .B \-e
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| 75 | Encode
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| 76 | .I infile
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| 77 | with respect to the library.
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| 78 | .TP
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| 79 | .B \-d
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| 80 | Decodes
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| 81 | .IR compressed-infile
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| 82 | with respect to the library.
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| 83 | .TP
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| 84 | .B \-l
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| 85 | This specifies lossy mode, and is the default mode for (de)compression.
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| 86 | Do not generate the residue. If used in encoding mode, does not store
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| 87 | the residue in the output. If used in decoding mode, the residue (if
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| 88 | it exists) is ignored.
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| 89 | .TP
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| 90 | .B \-L
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| 91 | Use lossless mode for (de)compression, which generates the residue.
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| 92 | If used in encoding mode, this stores the residue in the compressed
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| 93 | output. If used in decoding mode (assuming the residue is present),
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| 94 | this allows the original file to be recovered exactly.
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| 95 | .TP
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| 96 | .BI \-R\ filename
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| 97 | Stores the residue as an external file
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| 98 | .I filename
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| 99 | which could possibly be stored on another medium. During
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| 100 | decompression, if the residue file specified does not relate to the
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| 101 | compressed file, the resulting decompressed image will be a mess.
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| 102 | Note that only the width and height of the residue image is checked.
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| 103 | .TP
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| 104 | .BI \-Q
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| 105 | Uses a quicker form of compression. This option decreases the time
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| 106 | spent looking for a good match during encoding. On average this
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| 107 | option decreases compression ratios, but increases compression speed.
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| 108 | .TP
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| 109 | .BI \-X " [libraryfile]"
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| 110 | Use an external library file, instead of (de)compressing the library
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| 111 | within the normal stream. When decoding, the
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| 112 | .B \-X
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| 113 | option must be followed by the
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| 114 | .IR libraryfile .
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| 115 | .SH "SEE ALSO"
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| 116 | .na
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| 117 | .BR mg (1),
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| 118 | .BR mg_compression_dict (1),
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| 119 | .BR mg_fast_comp_dict (1),
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| 120 | .BR mg_get (1),
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| 121 | .BR mg_invf_dict (1),
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| 122 | .BR mg_invf_dump (1),
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| 123 | .BR mg_invf_rebuild (1),
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| 124 | .BR mg_passes (1),
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| 125 | .BR mg_perf_hash_build (1),
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| 126 | .BR mg_text_estimate (1),
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| 127 | .BR mg_weights_build (1),
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| 128 | .BR mgbilevel (1),
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| 129 | .BR mgbuild (1),
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| 130 | .BR mgdictlist (1),
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| 131 | .BR mgfelics (1),
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| 132 | .BR mgquery (1),
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| 133 | .BR mgstat (1),
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| 134 | .BR mgticbuild (1),
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| 135 | .BR mgticdump (1),
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| 136 | .BR mgticprune (1),
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| 137 | .BR mgticstat (1).
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