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annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 710:5da520cae945

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Bumped document revision forgotten in r684.
author Ruslan Ermilov <ru@nginx.com>
date Fri, 05 Oct 2012 04:37:53 +0000
parents 6c14c73d74ee
children 1e4f86ac3716
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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="2">
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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 на текущий момент это версия 2.0.35.
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31 </note>
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32 </para>
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33
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34 </section>
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35
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36
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37 <section id="example" name="Пример конфигурации">
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38
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39 <para>
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40 <example>
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41 location /img/ {
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42 proxy_pass http://backend;
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43 image_filter resize 150 100;
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44 image_filter rotate 90;
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45 error_page 415 = /empty;
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46 }
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47
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48 location = /empty {
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49 empty_gif;
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50 }
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51 </example>
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52 </para>
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53
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54 </section>
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55
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56
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57 <section id="directives" name="Директивы">
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58
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59 <directive name="image_filter">
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60 <syntax><literal>off</literal></syntax>
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61 <syntax><literal>test</literal></syntax>
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62 <syntax><literal>size</literal></syntax>
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63 <syntax>
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64 <literal>rotate</literal>
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65 <literal>90</literal> | <literal>180</literal> |
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66 <literal>270</literal></syntax>
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67 <syntax>
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68 <literal>resize</literal>
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69 <value>ширина</value>
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70 <value>высота</value></syntax>
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71 <syntax>
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72 <literal>crop</literal>
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73 <value>ширина</value>
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74 <value>высота</value></syntax>
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75 <default>off</default>
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76 <context>location</context>
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78 <para>
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79 Задаёт тип преобразования изображения:
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80 <list type="tag">
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81
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82 <tag-name><literal>off</literal></tag-name>
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83 <tag-desc>
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84 отключает обработку данным модулем во вложенном location.
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85 </tag-desc>
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86
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87 <tag-name><literal>test</literal></tag-name>
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88 <tag-desc>
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89 проверяет, что ответ действительно является изображением
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90 в формате JPEG, GIF или PNG.
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91 В противном случае возвращается ошибка
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92 <http-status code="415" text="Unsupported Media Type"/>.
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93 </tag-desc>
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94
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95 <tag-name><literal>size</literal></tag-name>
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96 <tag-desc>
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97 выдаёт информацию об изображении в формате JSON, например:
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98 <example>
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99 { "img" : { "width": 100, "height": 100, "type": "gif" } }
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100 </example>
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101 В случае ошибки выдаётся
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102 <example>
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103 {}
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104 </example>
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105 </tag-desc>
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106
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107 <tag-name><literal>rotate</literal>
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108 <literal>90</literal>|<literal>180</literal>|<literal>270</literal>
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109 </tag-name>
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110 <tag-desc>
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111 поворачивает изображение против часовой стрелки на указанное число градусов.
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112 В значении параметра допустимо использование переменных.
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113 Можно использовать как отдельно, так и совместно с преобразованиями
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114 <literal>resize</literal> и <literal>crop</literal>.
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115 </tag-desc>
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116
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117 <tag-name><literal>resize</literal>
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118 <value>ширина</value>
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119 <value>высота</value>
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120 </tag-name>
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121 <tag-desc>
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122 пропорционально уменьшает изображение до указанных размеров.
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123 Если требуется уменьшить только по одному измерению, то в качестве второго
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124 можно указать “<literal>-</literal>”.
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125 В случае ошибки сервер возвращает код
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126 <http-status code="415" text="Unsupported Media Type"/>.
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127 В значениях параметров допустимо использование переменных.
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128 При использовании совместно с <literal>rotate</literal>,
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129 поворот изображения происходит <emphasis>после</emphasis>
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130 уменьшения размеров изображения.
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131 </tag-desc>
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132
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133 <tag-name><literal>crop</literal>
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134 <value>ширина</value>
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135 <value>высота</value>
183
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136 </tag-name>
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137 <tag-desc>
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138 пропорционально уменьшает изображение до размера большей стороны
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139 и обрезает лишние края по другой стороне.
183
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140 Если требуется уменьшить только по одному измерению, то в качестве второго
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141 можно указать “<literal>-</literal>”.
183
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142 В случае ошибки сервер возвращает код
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143 <http-status code="415" text="Unsupported Media Type"/>.
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144 В значениях параметров допустимо использование переменных.
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145 При использовании совместно с <literal>rotate</literal>,
203
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146 поворот изображения происходит <emphasis>до</emphasis>
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147 уменьшения размеров изображения.
183
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148 </tag-desc>
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149
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150 </list>
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151 </para>
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152
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153 </directive>
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154
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155
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156 <directive name="image_filter_buffer">
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157 <syntax><value>размер</value></syntax>
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158 <default>1M</default>
183
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159 <context>http</context>
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160 <context>server</context>
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161 <context>location</context>
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162
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163 <para>
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164 Задаёт максимальный размер буфера для чтения изображения.
183
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165 При превышении размера сервер вернёт ошибку
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166 <http-status code="415" text="Unsupported Media Type"/>.
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167 </para>
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168
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169 </directive>
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170
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171
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172 <directive name="image_filter_jpeg_quality">
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173 <syntax><value>качество</value></syntax>
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174 <default>75</default>
183
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175 <context>http</context>
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176 <context>server</context>
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177 <context>location</context>
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178
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179 <para>
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180 Задаёт желаемое <value>качество</value> преобразованного изображения
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181 в формате JPEG.
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182 Допустимые значения находятся в диапазоне 1..100.
205
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183 Меньшим значениям обычно соответствует худшее качество изображения
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184 и меньший объём передаваемых данных.
183
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185 Максимальное рекомендуемое значение — 95.
271
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186 В значении параметра допустимо использование переменных.
183
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187 </para>
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188
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189 </directive>
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190
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191
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192 <directive name="image_filter_sharpen">
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193 <syntax><value>процент</value></syntax>
183
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194 <default>0</default>
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195 <context>http</context>
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196 <context>server</context>
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197 <context>location</context>
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198
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199 <para>
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200 Повышает резкость итогового изображения.
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201 Процент резкости может быть больше 100.
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202 Значение 0 отключает повышение резкости.
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203 В значении параметра допустимо использование переменных.
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204 </para>
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205
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206 </directive>
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207
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208
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209 <directive name="image_filter_transparency">
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210 <syntax><literal>on</literal>|<literal>off</literal></syntax>
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211 <default>on</default>
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212 <context>http</context>
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213 <context>server</context>
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214 <context>location</context>
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215
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216 <para>
203
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217 Определяет, сохранять ли прозрачность при обработке изображений
183
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218 в формате PNG с цветами, заданными палитрой, и в формате GIF.
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219 Потеря прозрачности позволяет получить более качественное изображение.
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220 Прозрачность альфа-канала в формате PNG сохраняется всегда.
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221 </para>
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222
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223 </directive>
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224
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225 </section>
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226
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227 </module>