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 224 <h1>ImageMagick JPEG-2000 Image Format</h1>
 225 <p class="navigation-index"></p>
 226
 227 <p>ImageMagick's JPEG-2000 image formats, JP2 and JPC, accept a plethora of encoding options as detailed below.  As an example, suppose you are interested in these options:</p>
 228
 229 <ul>
 230 <li>code blocks are 64 samples in width and 32 samples in height</li>
 231 <li>no multicomponent transform</li>
 232 <li>4 resolution levels for each component</li>
 233 <li>compression is lossy at 64:1</li>
 234 </ul>
 235
 236 <p>Use this command to convert a JPEG-2000 image to the PNG image format:</p>
 237
 238 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert wizard.jp2 wizard.png</span></p>
 239 <p>Here we extract an area from the image:</p>
 240
 241 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert 'wizard.jp2[640x480+0+0]' wizard.png</span></p>
 242 <p>Extract a particular tile from the image:</p>
 243
 244 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert 'wizard.jp2[2]' wizard.png</span></p>
 245 <p>Specify a subsampling factor:</p>
 246
 247 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert wizard.png -colorspace YUV -sampling-factor 2,2 wizard.jp2</span></p>
 248 <p>Save a tiled JPEG-2000 image:</p>
 249
 250 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert wizard.png 'wizard.png[512x512]'</span></p>
 251 <p>Write a digital Cinema 4K profile compliant codestream:</p>
 252
 253 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>convert wizard.png -resize 4096x2160! -depth 12 wizard.jp2</span></p>
 254 <p>Here is a complete list of JPEG-2000 decoding options:</p>
 255
 256 <dl class="doc">
 257 <dt class="doc">jp2:layer-number=<em>x</em></dt>
 258 <dd>set the maximum number of quality layers to decode.</dd>
 259 <dt class="doc">jp2:reduce-factor=<em>x</em></dt>
 260 <dd>set the number of highest resolution levels to be discarded.</dd>
 261 </dl>
 262
 263 <p>Here is a complete list of JPEG-2000 encoding options:</p>
 264
 265 <dl class="doc">
 266 <dt class="doc">jp2:number-resolutions=<em>x</em></dt>
 267 <dd>number of resolutions to encode.</dd>
 268 <dt class="doc">jp2:quality=<em>x</em>,<em>x</em>,...</dt>
 269 <dd>set the quality layer PSNR, given in dB. The order is from left to right in ascending order. The default is a single lossless quality layer.</dd>
 270 <dt class="doc">jp2:rate=<em>x</em>,<em>x</em>,...</dt>
 271 <dd>the compression ratio values. Each value is a factor of compression, thus 20 means 20 times compressed. The order is from left to right in descending order. A final lossless quality layer is signified by the value 1. The default is a single lossless quality layer.</dd>
 272 <dt class="doc">jp2:progression-order=<em>x</em></dt>
 273 <dd>choose from LRCP, RLCP, RPCL, PCRL or CPRL.</dd>
 274 </dl>
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