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 3745 2003-02-20 21:20:24Z mdewsnip $
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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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