Mercurial > hg > nginx-site
annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 313:16244471304a
Cosmetics.
author | Ruslan Ermilov <ru@nginx.com> |
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date | Fri, 13 Jan 2012 14:27:44 +0000 |
parents | 4c6d2c614d2c |
children | daae2b619815 |
rev | line source |
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222
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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> |
271 | 12 Модуль <literal>ngx_http_image_filter_module</literal> — это фильтр |
13 для преобразования изображений в форматах JPEG, GIF и PNG (0.7.54+). | |
203 | 14 </para> |
15 | |
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 |
271 | 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 name="Пример конфигурации" id="example"> |
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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 name="Директивы" id="directives"> |
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52 |
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53 <directive name="image_filter"> |
271 | 54 <syntax><literal>off</literal></syntax> |
55 <syntax><literal>test</literal></syntax> | |
56 <syntax><literal>size</literal></syntax> | |
57 <syntax><literal>rotate</literal> | |
58 <literal>90</literal> | <literal>180</literal> | <literal>270</literal></syntax> | |
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59 <syntax> |
271 | 60 <literal>resize</literal> |
61 <value>ширина</value> | |
62 <value>высота</value></syntax> | |
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63 <syntax> |
271 | 64 <literal>crop</literal> |
65 <value>ширина</value> | |
66 <value>высота</value></syntax> | |
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67 <default/> |
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68 <context>location</context> |
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69 |
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70 <para> |
203 | 71 Задаёт тип преобразования изображения: |
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72 <list type="tag"> |
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73 |
271 | 74 <tag-name><literal>off</literal></tag-name> |
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75 <tag-desc> |
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76 отключает обработку данным модулем во вложенном location. |
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77 </tag-desc> |
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78 |
271 | 79 <tag-name><literal>test</literal></tag-name> |
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80 <tag-desc> |
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81 проверяет, что ответ действительно является изображением |
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82 в формате JPEG, GIF или PNG. |
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83 В противном случае возвращается ошибка |
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84 <http-status code="415" text="Unsupported Media Type"/>. |
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85 </tag-desc> |
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86 |
271 | 87 <tag-name><literal>size</literal></tag-name> |
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88 <tag-desc> |
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89 выдаёт информацию об изображении в формате JSON, например: |
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90 <example> |
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91 { "img" : { "width": 100, "height": 100, "type": "gif" } } |
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92 </example> |
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93 В случае ошибки выдаётся |
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94 <example> |
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95 {} |
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96 </example> |
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97 </tag-desc> |
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98 |
271 | 99 <tag-name><literal>rotate</literal> |
100 <literal>90</literal>|<literal>180</literal>|<literal>270</literal> | |
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101 </tag-name> |
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102 <tag-desc> |
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103 поворачивает изображение против часовой стрелки на указанное число градусов. |
271 | 104 В значении параметра допустимо использование переменных. |
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105 Можно использовать как отдельно, так и совместно с преобразованиями |
271 | 106 <literal>resize</literal> и <literal>crop</literal>. |
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107 </tag-desc> |
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108 |
271 | 109 <tag-name><literal>resize</literal> |
110 <value>ширина</value> | |
111 <value>высота</value> | |
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112 </tag-name> |
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113 <tag-desc> |
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114 пропорционально уменьшает изображение до указанных размеров. |
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115 Если требуется уменьшить только по одному измерению, то в качестве второго |
271 | 116 можно указать “<literal>-</literal>”. |
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117 В случае ошибки сервер возвращает код |
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118 <http-status code="415" text="Unsupported Media Type"/>. |
271 | 119 В значениях параметров допустимо использование переменных. |
120 При использовании совместно с <literal>rotate</literal>, | |
203 | 121 поворот изображения происходит <emphasis>после</emphasis> |
122 уменьшения размеров изображения. | |
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123 </tag-desc> |
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124 |
271 | 125 <tag-name><literal>crop</literal> |
126 <value>ширина</value> | |
127 <value>высота</value> | |
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128 </tag-name> |
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129 <tag-desc> |
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130 пропорционально уменьшает изображение до размера большей стороны |
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131 и обрезает лишние края по другой стороне. |
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132 Если требуется уменьшить только по одному измерению, то в качестве второго |
271 | 133 можно указать “<literal>-</literal>”. |
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134 В случае ошибки сервер возвращает код |
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135 <http-status code="415" text="Unsupported Media Type"/>. |
271 | 136 В значениях параметров допустимо использование переменных. |
137 При использовании совместно с <literal>rotate</literal>, | |
203 | 138 поворот изображения происходит <emphasis>до</emphasis> |
139 уменьшения размеров изображения. | |
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140 </tag-desc> |
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141 |
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142 </list> |
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143 </para> |
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144 |
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145 </directive> |
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146 |
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147 |
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148 <directive name="image_filter_buffer"> |
102
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149 <syntax><value>размер</value></syntax> |
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150 <default>1M</default> |
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151 <context>http</context> |
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152 <context>server</context> |
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153 <context>location</context> |
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154 |
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155 <para> |
203 | 156 Задаёт максимальный размер буфера для чтения изображения. |
183
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157 При превышении размера сервер вернёт ошибку |
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158 <http-status code="415" text="Unsupported Media Type"/>. |
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159 </para> |
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160 |
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161 </directive> |
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162 |
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163 |
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164 <directive name="image_filter_jpeg_quality"> |
271 | 165 <syntax><value>качество</value></syntax> |
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166 <default>75</default> |
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167 <context>http</context> |
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168 <context>server</context> |
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169 <context>location</context> |
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170 |
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171 <para> |
271 | 172 Задаёт желаемое <value>качество</value> преобразованного изображения в формате JPEG. |
173 Допустимые значения находятся в диапазоне 1..100. | |
205 | 174 Меньшим значениям обычно соответствует худшее качество изображения |
175 и меньший объём передаваемых данных. | |
183
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176 Максимальное рекомендуемое значение — 95. |
271 | 177 В значении параметра допустимо использование переменных. |
183
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178 </para> |
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179 |
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180 </directive> |
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181 |
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182 |
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183 <directive name="image_filter_sharpen"> |
271 | 184 <syntax><value>процент</value></syntax> |
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185 <default>0</default> |
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186 <context>http</context> |
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187 <context>server</context> |
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188 <context>location</context> |
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189 |
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190 <para> |
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191 Повышает резкость итогового изображения. |
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192 Процент резкости может быть больше 100. |
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193 Значение 0 отключает повышение резкости. |
271 | 194 В значении параметра допустимо использование переменных. |
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195 </para> |
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196 |
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197 </directive> |
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198 |
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199 |
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200 <directive name="image_filter_transparency"> |
271 | 201 <syntax><literal>on</literal>|<literal>off</literal></syntax> |
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202 <default>on</default> |
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203 <context>http</context> |
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204 <context>server</context> |
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205 <context>location</context> |
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206 |
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207 <para> |
203 | 208 Определяет, сохранять ли прозрачность при обработке изображений |
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209 в формате PNG с цветами, заданными палитрой, и в формате GIF. |
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210 Потеря прозрачности позволяет получить более качественное изображение. |
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211 Прозрачность альфа-канала в формате PNG сохраняется всегда. |
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212 </para> |
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213 |
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214 </directive> |
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215 |
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216 </section> |
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217 |
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218 </module> |