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annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 966:95c3c3bbf1ce

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Text review.
author Egor Nikitin <yegor.nikitin@gmail.com>
date Wed, 14 Aug 2013 12:03:41 +0400
parents 1e4f86ac3716
children 6ebdef43330a
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1 <?xml version="1.0"?>
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2
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3 <!--
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4 Copyright (C) Igor Sysoev
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5 Copyright (C) Nginx, Inc.
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6 -->
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7
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8 <!DOCTYPE module SYSTEM "../../../../dtd/module.dtd">
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9
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10 <module name="Модуль ngx_http_image_filter_module"
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11 link="/ru/docs/http/ngx_http_image_filter_module.html"
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12 lang="ru"
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13 rev="3">
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14
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15 <section id="summary">
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16
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17 <para>
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18 Модуль <literal>ngx_http_image_filter_module</literal> (0.7.54+) — это фильтр
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19 для преобразования изображений в форматах JPEG, GIF и PNG.
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20 </para>
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21
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22 <para>
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23 По умолчанию этот модуль не собирается, его сборку необходимо
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24 разрешить с помощью конфигурационного параметра
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25 <literal>--with-http_image_filter_module</literal>.
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26 <note>
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27 Для сборки и работы этого модуля необходима библиотека
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28 <link url="http://libgd.org">libgd</link>.
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29 Рекомендуется использовать самую последнюю версию библиотеки.
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30 </note>
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31 </para>
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32
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33 </section>
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34
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35
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36 <section id="example" name="Пример конфигурации">
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37
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38 <para>
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39 <example>
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40 location /img/ {
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41 proxy_pass http://backend;
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42 image_filter resize 150 100;
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43 image_filter rotate 90;
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44 error_page 415 = /empty;
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45 }
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46
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47 location = /empty {
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48 empty_gif;
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49 }
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50 </example>
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51 </para>
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52
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53 </section>
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54
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55
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56 <section id="directives" name="Директивы">
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57
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58 <directive name="image_filter">
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59 <syntax><literal>off</literal></syntax>
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60 <syntax><literal>test</literal></syntax>
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61 <syntax><literal>size</literal></syntax>
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62 <syntax>
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63 <literal>rotate</literal>
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64 <literal>90</literal> | <literal>180</literal> |
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65 <literal>270</literal></syntax>
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66 <syntax>
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67 <literal>resize</literal>
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68 <value>ширина</value>
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69 <value>высота</value></syntax>
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70 <syntax>
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71 <literal>crop</literal>
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72 <value>ширина</value>
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73 <value>высота</value></syntax>
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74 <default>off</default>
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75 <context>location</context>
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77 <para>
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78 Задаёт тип преобразования изображения:
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79 <list type="tag">
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80
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81 <tag-name><literal>off</literal></tag-name>
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82 <tag-desc>
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83 отключает обработку данным модулем во вложенном location.
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84 </tag-desc>
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86 <tag-name><literal>test</literal></tag-name>
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87 <tag-desc>
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88 проверяет, что ответ действительно является изображением
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89 в формате JPEG, GIF или PNG.
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90 В противном случае возвращается ошибка
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91 <http-status code="415" text="Unsupported Media Type"/>.
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92 </tag-desc>
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93
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94 <tag-name><literal>size</literal></tag-name>
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95 <tag-desc>
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96 выдаёт информацию об изображении в формате JSON, например:
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97 <example>
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98 { "img" : { "width": 100, "height": 100, "type": "gif" } }
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99 </example>
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100 В случае ошибки выдаётся
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101 <example>
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102 {}
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103 </example>
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104 </tag-desc>
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105
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106 <tag-name><literal>rotate</literal>
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107 <literal>90</literal>|<literal>180</literal>|<literal>270</literal>
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108 </tag-name>
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109 <tag-desc>
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110 поворачивает изображение против часовой стрелки на указанное число градусов.
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111 В значении параметра допустимо использование переменных.
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112 Можно использовать как отдельно, так и совместно с преобразованиями
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113 <literal>resize</literal> и <literal>crop</literal>.
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114 </tag-desc>
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115
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116 <tag-name><literal>resize</literal>
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117 <value>ширина</value>
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118 <value>высота</value>
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119 </tag-name>
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120 <tag-desc>
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121 пропорционально уменьшает изображение до указанных размеров.
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122 Если требуется уменьшить только по одному измерению, то в качестве второго
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123 можно указать “<literal>-</literal>”.
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124 В случае ошибки сервер возвращает код
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125 <http-status code="415" text="Unsupported Media Type"/>.
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126 В значениях параметров допустимо использование переменных.
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127 При использовании совместно с <literal>rotate</literal>,
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128 поворот изображения происходит <emphasis>после</emphasis>
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129 уменьшения размеров изображения.
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130 </tag-desc>
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131
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132 <tag-name><literal>crop</literal>
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133 <value>ширина</value>
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134 <value>высота</value>
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135 </tag-name>
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136 <tag-desc>
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137 пропорционально уменьшает изображение до размера большей стороны
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138 и обрезает лишние края по другой стороне.
183
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139 Если требуется уменьшить только по одному измерению, то в качестве второго
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140 можно указать “<literal>-</literal>”.
183
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141 В случае ошибки сервер возвращает код
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142 <http-status code="415" text="Unsupported Media Type"/>.
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143 В значениях параметров допустимо использование переменных.
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144 При использовании совместно с <literal>rotate</literal>,
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145 поворот изображения происходит <emphasis>до</emphasis>
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146 уменьшения размеров изображения.
183
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147 </tag-desc>
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148
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149 </list>
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150 </para>
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151
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152 </directive>
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153
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154
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155 <directive name="image_filter_buffer">
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156 <syntax><value>размер</value></syntax>
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157 <default>1M</default>
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158 <context>http</context>
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159 <context>server</context>
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160 <context>location</context>
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161
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162 <para>
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163 Задаёт максимальный размер буфера для чтения изображения.
183
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164 При превышении размера сервер вернёт ошибку
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165 <http-status code="415" text="Unsupported Media Type"/>.
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166 </para>
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167
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168 </directive>
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169
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170
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171 <directive name="image_filter_interlace">
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172 <syntax><literal>on</literal> | <literal>off</literal></syntax>
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173 <default>off</default>
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174 <context>http</context>
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175 <context>server</context>
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176 <context>location</context>
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177 <appeared-in>1.3.15</appeared-in>
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178
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179 <para>
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180 Если включено, то итоговые изображения будут с чересстрочностью.
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181 В случае JPEG итоговые изображения будут в формате “progressive JPEG”.
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182 </para>
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183
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184 </directive>
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185
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186
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187 <directive name="image_filter_jpeg_quality">
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188 <syntax><value>качество</value></syntax>
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189 <default>75</default>
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190 <context>http</context>
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191 <context>server</context>
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192 <context>location</context>
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193
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194 <para>
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195 Задаёт желаемое <value>качество</value> преобразованного изображения
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196 в формате JPEG.
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197 Допустимые значения находятся в диапазоне от 1 до 100.
205
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198 Меньшим значениям обычно соответствует худшее качество изображения
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199 и меньший объём передаваемых данных.
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200 Максимальное рекомендуемое значение — 95.
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201 В значении параметра допустимо использование переменных.
183
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202 </para>
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203
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204 </directive>
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205
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206
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207 <directive name="image_filter_sharpen">
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208 <syntax><value>процент</value></syntax>
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209 <default>0</default>
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210 <context>http</context>
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211 <context>server</context>
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212 <context>location</context>
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213
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214 <para>
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215 Повышает резкость итогового изображения.
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216 Процент резкости может быть больше 100.
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217 Значение 0 отключает повышение резкости.
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218 В значении параметра допустимо использование переменных.
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219 </para>
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220
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221 </directive>
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222
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223
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224 <directive name="image_filter_transparency">
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225 <syntax><literal>on</literal>|<literal>off</literal></syntax>
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226 <default>on</default>
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227 <context>http</context>
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228 <context>server</context>
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229 <context>location</context>
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230
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231 <para>
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232 Определяет, сохранять ли прозрачность при обработке изображений
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233 в формате GIF и в формате PNG с цветами, заданными палитрой.
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234 Потеря прозрачности позволяет получить более качественное изображение.
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235 Прозрачность альфа-канала в формате PNG сохраняется всегда.
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236 </para>
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237
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238 </directive>
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239
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240 </section>
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241
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242 </module>