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annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 271:4c6d2c614d2c

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Cleaned up XML tag mess: - all of <parameter> and <code>, and some of <dirname>, <value>, and <command> were replaced by <literal>; - the rest of <dirname> were replaced by links; - <argument> were replaced by <value>; - <value> is now rendered in HTML in italic; - <literal> and <path> can now contain <value>. Cleaned up terminology mess: - directives take "parameters".
author Ruslan Ermilov <ru@nginx.com>
date Fri, 23 Dec 2011 17:29:59 +0000
parents 945d7299c26c
children daae2b619815
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> — это фильтр
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13 для преобразования изображений в форматах JPEG, GIF и PNG (0.7.54+).
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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 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">
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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><literal>rotate</literal>
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58 <literal>90</literal> | <literal>180</literal> | <literal>270</literal></syntax>
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59 <syntax>
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60 <literal>resize</literal>
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61 <value>ширина</value>
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62 <value>высота</value></syntax>
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63 <syntax>
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64 <literal>crop</literal>
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65 <value>ширина</value>
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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>
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71 Задаёт тип преобразования изображения:
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72 <list type="tag">
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73
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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
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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
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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
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99 <tag-name><literal>rotate</literal>
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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.
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104 В значении параметра допустимо использование переменных.
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105 Можно использовать как отдельно, так и совместно с преобразованиями
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106 <literal>resize</literal> и <literal>crop</literal>.
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107 </tag-desc>
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108
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109 <tag-name><literal>resize</literal>
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110 <value>ширина</value>
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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
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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"/>.
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119 В значениях параметров допустимо использование переменных.
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120 При использовании совместно с <literal>rotate</literal>,
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121 поворот изображения происходит <emphasis>после</emphasis>
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122 уменьшения размеров изображения.
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123 </tag-desc>
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124
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125 <tag-name><literal>crop</literal>
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126 <value>ширина</value>
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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.
183
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132 Если требуется уменьшить только по одному измерению, то в качестве второго
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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"/>.
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136 В значениях параметров допустимо использование переменных.
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137 При использовании совместно с <literal>rotate</literal>,
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138 поворот изображения происходит <emphasis>до</emphasis>
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139 уменьшения размеров изображения.
183
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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">
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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>
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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">
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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>
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172 Задаёт желаемое <value>качество</value> преобразованного изображения в формате JPEG.
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173 Допустимые значения находятся в диапазоне 1..100.
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174 Меньшим значениям обычно соответствует худшее качество изображения
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175 и меньший объём передаваемых данных.
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176 Максимальное рекомендуемое значение — 95.
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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">
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184 <syntax><value>процент</value></syntax>
183
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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.
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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">
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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
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208 Определяет, сохранять ли прозрачность при обработке изображений
183
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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>