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annotate xml/ru/docs/http/ngx_http_image_filter_module.xml @ 183:aa4c2b46a4a3

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Revised ngx_http_image_filter_module documentation, unfinished.
author Igor Sysoev <igor@sysoev.ru>
date Tue, 15 Nov 2011 09:39:56 +0000
parents 40eec261c2a6
children 4840aa7bab2c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 <?xml version="1.0" encoding="utf-8"?>
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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 ngx_http_image_filter_module — это фильтр для преобразования
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13 изображений в форматах JPEG, GIF и PNG (0.7.54+).
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14 <note>
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15 По умолчанию этот модуль не собирается, его сборку необходимо
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16 разрешить с помощью конфигурационного параметра
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17 <code>--with-http_image_filter_module</code>.
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18 </note>
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19 <note>
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20 Для сборки и работы этого модуля необходима библиотека
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21 <link url="http://libgd.org">libgd</link>.
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22 Рекомендуется использовать самую последнюю версию библиотеки,
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23 на текущий момент это версия 2.0.35.
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24 </note>
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25 </para>
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26
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27 </section>
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28
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29
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30 <section name="Пример конфигурации" id="example">
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31
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32 <para>
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33 <example>
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34 location /img/ {
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35 proxy_pass http://backend;
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36 image_filter resize 150 100;
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37 error_page 415 = /empty;
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38 }
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39
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40 location = /empty {
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41 empty_gif;
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42 }
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43 </example>
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44 </para>
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45
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46 </section>
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47
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48
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49 <section name="Директивы" id="directives">
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50
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51 <directive name="image_filter">
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52 <syntax><parameter>off</parameter></syntax>
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53 <syntax><parameter>test</parameter></syntax>
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54 <syntax><parameter>size</parameter></syntax>
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55 <syntax><parameter>rotate </parameter>
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56 <value>90</value>|<value>180</value>|<value>270</value>
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57 </syntax>
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58 <syntax>
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59 <parameter>resize </parameter>
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60 <argument>ширина высота</argument>
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61 </syntax>
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62 <syntax>
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63 <parameter>crop </parameter>
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64 <argument>ширина высота</argument>
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65 </syntax>
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66 <default/>
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67 <context>location</context>
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68
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69 <para>
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70 Директива задаёт тип преобразования изображения:
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71 <list type="tag">
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72
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73 <tag-name><parameter>off</parameter></tag-name>
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74 <tag-desc>
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75 отключает обработку данным модулем во вложенном location.
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76 </tag-desc>
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78 <tag-name><parameter>test</parameter></tag-name>
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79 <tag-desc>
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80 проверяет, что ответ действительно является изображением
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81 в формате JPEG, GIF или PNG.
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82 В противном случае возвращается ошибка
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83 <http-status code="415" text="Unsupported Media Type"/>.
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84 </tag-desc>
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85
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86 <tag-name><parameter>size</parameter></tag-name>
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87 <tag-desc>
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88 выдаёт информацию об изображении в формате JSON, например:
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89 <example>
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90 { "img" : { "width": 100, "height": 100, "type": "gif" } }
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91 </example>
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92 В случае ошибки выдаётся
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93 <example>
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94 {}
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95 </example>
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96 </tag-desc>
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97
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98 <tag-name><parameter>rotate </parameter>
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99 <value>90</value>|<value>180</value>|<value>270</value>
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100 </tag-name>
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101 <tag-desc>
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102 поворачивает изображение по часовой стрелке на указанное число градусов.
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103 </tag-desc>
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104
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105 <tag-name><parameter>resize </parameter>
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106 <argument>ширина высота</argument>
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107 </tag-name>
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108 <tag-desc>
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109 пропорционально уменьшает изображение до указанных размеров.
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110 Если требуется уменьшить только по одному измерению, то в качестве второго
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111 можно указать “<code>-</code>”.
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112 В случае ошибки сервер возвращает код
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113 <http-status code="415" text="Unsupported Media Type"/>.
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114 </tag-desc>
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115
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116 <tag-name><parameter>crop </parameter>
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117 <argument>ширина высота</argument>
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118 </tag-name>
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119 <tag-desc>
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120 пропорционально уменьшает изображение до размера большей стороны
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121 и обрезает лишние края по другой стороне.
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122 Если требуется уменьшить только по одному измерению, то в качестве второго
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123 можно указать “<code>-</code>”.
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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 </tag-desc>
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127
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128 </list>
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129 </para>
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130
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131 </directive>
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132
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133
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134 <directive name="image_filter_buffer">
102
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135 <syntax><value>размер</value></syntax>
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136 <default>1M</default>
183
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137 <context>http</context>
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138 <context>server</context>
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139 <context>location</context>
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140
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141 <para>
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142 Директива задаёт максимальный размер буфера для чтения изображения.
183
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143 При превышении размера сервер вернёт ошибку
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144 <http-status code="415" text="Unsupported Media Type"/>.
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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_jpeg_quality">
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151 <syntax><value>1..100</value></syntax>
102
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152 <default>75</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 Директива задаёт коэффициент потери информации при обработке изображений
183
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159 в формате JPEG.
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160 Максимальное рекомендуемое значение — 95.
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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_sharpen">
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167 <syntax><argument>процент</argument></syntax>
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168 <default>0</default>
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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 Повышает резкость итогового изображения.
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175 Процент резкости может быть больше 100.
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176 Значение 0 отключает повышение резкости.
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177 </para>
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178
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179 </directive>
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180
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181
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182 <directive name="image_filter_transparency">
183
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183 <syntax><value>on</value>|<value>off</value></syntax>
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184 <default>on</default>
183
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185 <context>http</context>
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186 <context>server</context>
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187 <context>location</context>
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188
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189 <para>
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190 Директива определяет, сохранять ли прозрачность при обработке изображений
183
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191 в формате PNG с цветами, заданными палитрой, и в формате GIF.
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192 Потеря прозрачности позволяет получить более качественное изображение.
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193 Прозрачность альфа-канала в формате PNG сохраняется всегда.
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194 </para>
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195
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196 </directive>
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197
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198 </section>
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199
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200 </module>