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1 <!-- Creator : groff version 1.18.1 --> |
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2 <!-- CreationDate: Mon Mar 13 18:03:13 2006 --> |
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3 <html> |
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4 <head> |
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5 <meta name="generator" content="groff -Thtml, see www.gnu.org"> |
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6 <meta name="Content-Style" content="text/css"> |
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7 <title>TIFFDITHER</title> |
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8 </head> |
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9 <body> |
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10 |
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11 <h1 align=center>TIFFDITHER</h1> |
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12 <a href="#NAME">NAME</a><br> |
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13 <a href="#SYNOPSIS">SYNOPSIS</a><br> |
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14 <a href="#DESCRIPTION">DESCRIPTION</a><br> |
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15 <a href="#OPTIONS">OPTIONS</a><br> |
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16 <a href="#NOTES">NOTES</a><br> |
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17 <a href="#SEE ALSO">SEE ALSO</a><br> |
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18 |
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19 <hr> |
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20 <a name="NAME"></a> |
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21 <h2>NAME</h2> |
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22 <!-- INDENTATION --> |
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25 <tr valign="top" align="left"> |
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26 <td width="8%"></td> |
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27 <td width="91%"> |
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28 <p>tiffdither − convert a greyscale image to bilevel |
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29 using dithering</p> |
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30 </td> |
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31 </table> |
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32 <a name="SYNOPSIS"></a> |
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33 <h2>SYNOPSIS</h2> |
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34 <!-- INDENTATION --> |
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38 <td width="8%"></td> |
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39 <td width="91%"> |
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40 <p><b>tiffdither</b> [ <i>options</i> ] <i>input.tif |
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41 output.tif</i></p> |
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42 </td> |
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43 </table> |
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44 <a name="DESCRIPTION"></a> |
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45 <h2>DESCRIPTION</h2> |
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46 <!-- INDENTATION --> |
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49 <tr valign="top" align="left"> |
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50 <td width="8%"></td> |
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51 <td width="91%"> |
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52 <p><i>tiffdither</i> converts a single channel 8-bit |
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53 greyscale image to a bilevel image using Floyd-Steinberg |
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54 error propagation with thresholding.</p> |
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55 </td> |
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56 </table> |
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57 <a name="OPTIONS"></a> |
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58 <h2>OPTIONS</h2> |
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59 <!-- TABS --> |
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60 <table width="100%" border=0 rules="none" frame="void" |
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61 cols="5" cellspacing="0" cellpadding="0"> |
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62 <tr valign="top" align="left"> |
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63 <td width="10%"></td> |
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64 <td width="2%"> |
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65 |
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66 <p><b>−c</b></p> |
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67 </td> |
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68 <td width="6%"></td> |
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69 <td width="80%"> |
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70 |
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71 <p>Specify the compression to use for data written to the |
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72 output file: <b>none</b> for no compression, <b>packbits</b> |
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73 for PackBits compression, <b>lzw</b> for Lempel-Ziv & |
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74 Welch compression, <b>zip</b> for Deflate compression, |
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75 <b>g3</b> for CCITT Group 3 (T.4) compression, and <b>g4</b> |
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76 for CCITT Group 4 (T.6) compression. By default |
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77 <i>tiffdither</i> will compress data according to the value |
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78 of the <i>Compression</i> tag found in the source file.</p> |
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79 </td> |
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80 <td width="0%"> |
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81 </td> |
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82 </table> |
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83 <!-- INDENTATION --> |
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84 <table width="100%" border=0 rules="none" frame="void" |
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85 cols="2" cellspacing="0" cellpadding="0"> |
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86 <tr valign="top" align="left"> |
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87 <td width="17%"></td> |
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88 <td width="82%"> |
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89 <p>The <small>CCITT</small> Group 3 and Group 4 compression |
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90 algorithms can only be used with bilevel data.</p> |
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91 <!-- INDENTATION --> |
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92 <p>Group 3 compression can be specified together with |
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93 several T.4-specific options: <b>1d</b> for 1-dimensional |
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94 encoding, <b>2d</b> for 2-dimensional encoding, and |
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95 <b>fill</b> to force each encoded scanline to be zero-filled |
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96 so that the terminating EOL code lies on a byte boundary. |
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97 Group 3-specific options are specified by appending a |
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98 ‘‘:’’-separated list to the |
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99 ‘‘g3’’ option; e.g. <b>−c |
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100 g3:2d:fill</b> to get 2D-encoded data with byte-aligned EOL |
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101 codes.</p> |
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102 <!-- INDENTATION --> |
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103 <p><small>LZW</small> compression can be specified together |
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104 with a <i>predictor</i> value. A predictor value of 2 causes |
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105 each scanline of the output image to undergo horizontal |
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106 differencing before it is encoded; a value of 1 forces each |
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107 scanline to be encoded without differencing. LZW-specific |
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108 options are specified by appending a |
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109 ‘‘:’’-separated list to the |
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110 ‘‘lzw’’ option; e.g. <b>−c |
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111 lzw:2</b> for <small>LZW</small> compression with horizontal |
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112 differencing.</p> |
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113 </td> |
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114 </table> |
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115 <!-- TABS --> |
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116 <table width="100%" border=0 rules="none" frame="void" |
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117 cols="5" cellspacing="0" cellpadding="0"> |
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118 <tr valign="top" align="left"> |
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119 <td width="10%"></td> |
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120 <td width="3%"> |
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121 |
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122 <p><b>−f</b></p> |
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123 </td> |
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124 <td width="5%"></td> |
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125 <td width="80%"> |
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126 |
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127 <p>Specify the bit fill order to use in writing output |
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128 data. By default, <i>tiffdither</i> will create a new file |
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129 with the same fill order as the original. Specifying |
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130 <b>−f lsb2msb</b> will force data to be written with |
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131 the FillOrder tag set to <small>LSB2MSB ,</small> while |
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132 <b>−f msb2lsb</b> will force data to be written with |
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133 the FillOrder tag set to <small>MSB2LSB .</small></p> |
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134 </td> |
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135 <td width="0%"> |
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136 </td> |
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137 <tr valign="top" align="left"> |
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138 <td width="10%"></td> |
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139 <td width="3%"> |
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140 |
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141 <p><b>−t</b></p> |
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142 </td> |
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143 <td width="5%"></td> |
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144 <td width="80%"> |
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145 |
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146 <p>Set the threshold value for dithering. By default the |
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147 threshold value is 128.</p> |
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148 </td> |
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149 <td width="0%"> |
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150 </td> |
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151 </table> |
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152 <a name="NOTES"></a> |
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153 <h2>NOTES</h2> |
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154 <!-- INDENTATION --> |
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157 <tr valign="top" align="left"> |
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158 <td width="8%"></td> |
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159 <td width="91%"> |
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160 <p>The dither algorithm is taken from the |
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161 <b>tiffmedian</b>(1) program (written by Paul Heckbert).</p> |
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162 </td> |
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163 </table> |
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164 <a name="SEE ALSO"></a> |
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165 <h2>SEE ALSO</h2> |
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166 <!-- INDENTATION --> |
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167 <table width="100%" border=0 rules="none" frame="void" |
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168 cols="2" cellspacing="0" cellpadding="0"> |
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169 <tr valign="top" align="left"> |
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170 <td width="8%"></td> |
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171 <td width="91%"> |
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172 <p><b>pal2rgb</b>(1), <b>fax2tiff</b>(1), |
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173 <b>tiffinfo</b>(1), <b>tiffcp</b>(1), <b>tiff2bw</b>(1), |
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174 <b>libtiff</b>(3TIFF)</p> |
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175 <!-- INDENTATION --> |
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176 <p>Libtiff library home page: |
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177 <b>http://www.remotesensing.org/libtiff/</b></p> |
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178 </td> |
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179 </table> |
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180 <hr> |
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181 </body> |
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182 </html> |