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533 <td>Note, JPEG is a lossy compression. In addition, you cannot create black and white images with JPEG nor can you save transparency.<br /><br /> Requires <a href="http://www.ijg.org/files/">jpegsrc.v8c.tar.gz</a>. You can set quality scaling for luminance and chrominance separately (e.g. <a href="command-line-options.html#quality">-quality</a> 90,70). You can optionally define the DCT method, for example to specify the float method, use <a href="command-line-options.html#define">-define jpeg:dct-method=float</a>. By default we compute optimal Huffman coding tables. Specify <a href="command-line-options.html#define">-define jpeg:optimize-coding=false</a> to use the default Huffman tables. Two other options include <a href="command-line-options.html#define">-define jpeg:block-smoothing</a> and <a href="command-line-options.html#define">-define jpeg:fancy-upsampling</a>. Set the sampling factor with <a href="command-line-options.html#define">-define jpeg:sampling-factor</a>. You can size the image with <code>jpeg:size</code>, for example <a href="command-line-options.html#define">-define jpeg:size=128x128</a>. To restrict the maximum file size, use <code>jpeg:extent</code>, for example <a href="command-line-options.html#define">-define jpeg:extent=400KB</a>. To define one or more custom quantization tables, use <a href="command-line-options.html#define">-define jpeg:q-table=<i>filename</i></a>. To avoid reading a particular associated image profile, use <a href="command-line-options.html#define">-define profile:skip=<i>name</i></a> (e.g. profile:skip=ICC).</td>
