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annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 364:bb51d3e17dd0

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Style fixed.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 27 Jan 2012 10:39:12 +0000
parents daae2b619815
children be54c443235a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?xml version="1.0"?>
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2
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3 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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4
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5 <module name="Модуль ngx_http_image_filter_module"
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6 link="/ru/docs/http/ngx_http_image_filter_module.html"
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7 lang="ru">
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8
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9 <section id="summary">
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10
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11 <para>
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12 Модуль <literal>ngx_http_image_filter_module</literal> (0.7.54+) — это фильтр
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13 для преобразования изображений в форматах JPEG, GIF и PNG.
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14 </para>
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15
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16 <para>
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17 По умолчанию этот модуль не собирается, его сборку необходимо
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18 разрешить с помощью конфигурационного параметра
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19 <literal>--with-http_image_filter_module</literal>.
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20 <note>
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21 Для сборки и работы этого модуля необходима библиотека
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22 <link url="http://libgd.org">libgd</link>.
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23 Рекомендуется использовать самую последнюю версию библиотеки,
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24 на текущий момент это версия 2.0.35.
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25 </note>
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26 </para>
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27
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28 </section>
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29
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30
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31 <section id="example" name="Пример конфигурации">
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32
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33 <para>
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34 <example>
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35 location /img/ {
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36 proxy_pass http://backend;
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37 image_filter resize 150 100;
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38 image_filter rotate 90;
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39 error_page 415 = /empty;
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40 }
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41
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42 location = /empty {
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43 empty_gif;
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44 }
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45 </example>
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46 </para>
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47
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48 </section>
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49
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50
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51 <section id="directives" name="Директивы">
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52
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53 <directive name="image_filter">
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54 <syntax><literal>off</literal></syntax>
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55 <syntax><literal>test</literal></syntax>
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56 <syntax><literal>size</literal></syntax>
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57 <syntax>
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58 <literal>rotate</literal>
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59 <literal>90</literal> | <literal>180</literal> |
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60 <literal>270</literal></syntax>
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61 <syntax>
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62 <literal>resize</literal>
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63 <value>ширина</value>
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64 <value>высота</value></syntax>
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65 <syntax>
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66 <literal>crop</literal>
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67 <value>ширина</value>
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68 <value>высота</value></syntax>
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69 <default/>
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70 <context>location</context>
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71
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72 <para>
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73 Задаёт тип преобразования изображения:
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74 <list type="tag">
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75
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76 <tag-name><literal>off</literal></tag-name>
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77 <tag-desc>
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78 отключает обработку данным модулем во вложенном location.
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79 </tag-desc>
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81 <tag-name><literal>test</literal></tag-name>
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82 <tag-desc>
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83 проверяет, что ответ действительно является изображением
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84 в формате JPEG, GIF или PNG.
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85 В противном случае возвращается ошибка
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86 <http-status code="415" text="Unsupported Media Type"/>.
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87 </tag-desc>
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89 <tag-name><literal>size</literal></tag-name>
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90 <tag-desc>
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91 выдаёт информацию об изображении в формате JSON, например:
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92 <example>
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93 { "img" : { "width": 100, "height": 100, "type": "gif" } }
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94 </example>
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95 В случае ошибки выдаётся
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96 <example>
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97 {}
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98 </example>
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99 </tag-desc>
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100
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101 <tag-name><literal>rotate</literal>
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102 <literal>90</literal>|<literal>180</literal>|<literal>270</literal>
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103 </tag-name>
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104 <tag-desc>
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105 поворачивает изображение против часовой стрелки на указанное число градусов.
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106 В значении параметра допустимо использование переменных.
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107 Можно использовать как отдельно, так и совместно с преобразованиями
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108 <literal>resize</literal> и <literal>crop</literal>.
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109 </tag-desc>
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111 <tag-name><literal>resize</literal>
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112 <value>ширина</value>
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113 <value>высота</value>
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114 </tag-name>
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115 <tag-desc>
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116 пропорционально уменьшает изображение до указанных размеров.
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117 Если требуется уменьшить только по одному измерению, то в качестве второго
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118 можно указать “<literal>-</literal>”.
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119 В случае ошибки сервер возвращает код
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120 <http-status code="415" text="Unsupported Media Type"/>.
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121 В значениях параметров допустимо использование переменных.
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122 При использовании совместно с <literal>rotate</literal>,
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123 поворот изображения происходит <emphasis>после</emphasis>
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124 уменьшения размеров изображения.
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125 </tag-desc>
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126
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127 <tag-name><literal>crop</literal>
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128 <value>ширина</value>
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129 <value>высота</value>
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130 </tag-name>
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131 <tag-desc>
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132 пропорционально уменьшает изображение до размера большей стороны
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133 и обрезает лишние края по другой стороне.
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134 Если требуется уменьшить только по одному измерению, то в качестве второго
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135 можно указать “<literal>-</literal>”.
183
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136 В случае ошибки сервер возвращает код
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137 <http-status code="415" text="Unsupported Media Type"/>.
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138 В значениях параметров допустимо использование переменных.
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139 При использовании совместно с <literal>rotate</literal>,
203
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140 поворот изображения происходит <emphasis>до</emphasis>
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141 уменьшения размеров изображения.
183
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142 </tag-desc>
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143
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144 </list>
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145 </para>
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146
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147 </directive>
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148
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149
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150 <directive name="image_filter_buffer">
102
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151 <syntax><value>размер</value></syntax>
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152 <default>1M</default>
183
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153 <context>http</context>
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154 <context>server</context>
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155 <context>location</context>
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156
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157 <para>
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158 Задаёт максимальный размер буфера для чтения изображения.
183
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159 При превышении размера сервер вернёт ошибку
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160 <http-status code="415" text="Unsupported Media Type"/>.
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161 </para>
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162
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163 </directive>
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164
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165
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166 <directive name="image_filter_jpeg_quality">
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167 <syntax><value>качество</value></syntax>
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168 <default>75</default>
183
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169 <context>http</context>
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170 <context>server</context>
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171 <context>location</context>
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172
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173 <para>
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174 Задаёт желаемое <value>качество</value> преобразованного изображения
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175 в формате JPEG.
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176 Допустимые значения находятся в диапазоне 1..100.
205
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177 Меньшим значениям обычно соответствует худшее качество изображения
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178 и меньший объём передаваемых данных.
183
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179 Максимальное рекомендуемое значение — 95.
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180 В значении параметра допустимо использование переменных.
183
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181 </para>
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182
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183 </directive>
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184
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185
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186 <directive name="image_filter_sharpen">
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187 <syntax><value>процент</value></syntax>
183
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188 <default>0</default>
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189 <context>http</context>
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190 <context>server</context>
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191 <context>location</context>
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192
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193 <para>
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194 Повышает резкость итогового изображения.
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195 Процент резкости может быть больше 100.
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196 Значение 0 отключает повышение резкости.
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197 В значении параметра допустимо использование переменных.
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198 </para>
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199
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200 </directive>
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201
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202
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203 <directive name="image_filter_transparency">
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204 <syntax><literal>on</literal>|<literal>off</literal></syntax>
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205 <default>on</default>
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206 <context>http</context>
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207 <context>server</context>
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208 <context>location</context>
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209
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210 <para>
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211 Определяет, сохранять ли прозрачность при обработке изображений
183
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212 в формате PNG с цветами, заданными палитрой, и в формате GIF.
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213 Потеря прозрачности позволяет получить более качественное изображение.
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214 Прозрачность альфа-канала в формате PNG сохраняется всегда.
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215 </para>
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216
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217 </directive>
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218
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219 </section>
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220
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221 </module>