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which can be 1, 2, 4, or 8. In such files, the color samples always have
8-bit depth.</dd>
+<dt>png:compression-filter=<em class="arg">value</em></dt>
+ <dd> valid values are 0 through 7. 0-4 are the corresponding PNG filters,
+ 5 means adaptive filtering except for images with a colormap, 6 means
+ adaptive filtering for all images, 7 means MNG "loco" compression.</dd>
+
+<dt>png:compression-level=<em class="arg">value</em></dt>
+ <dd> valid values are 0 through 9, with 0 providing the least but fastest
+ compression and 9 usually providing the best and always the slowest.</dd>
+
+<dt>png:compression-strategy=<em class="arg">value</em></dt>
+ <dd> valid values are 0 through 4, meaning default, filtered, huffman_only,
+ rle, and fixed ZLIB compression strategy. If you are using an old zlib
+ that does not support Z_RLE (before 1.2.0) or Z_FIXED (before 1.2.2.2),
+ values 3 and 4, respectively, will use the zlib default strategy
+ instead.</dd>
+
<dt>png:exclude-chunk=<em class="arg">value</em></dt>
<dt>png:include-chunk=<em class="arg">value</em></dt>
<dd>ancillary chunks to be excluded from or included in PNG output.
</pre>
<p>The critical PNG chunks <kbd>IHDR</kbd>, <kbd>PLTE</kbd>,
- <kbd>IDAT</kbd>, and <kbd>IEND</kbd> cannot be excluded. Any of
- these entries appearing in the list will be ignored.</p>
+ <kbd>IDAT</kbd>, and <kbd>IEND</kbd> cannot be excluded. Any such
+ entries appearing in the list will be ignored.</p>
<p>If the ancillary PNG <kbd>tRNS</kbd> chunk is excluded and the
image has transparency, the PNG colortype is forced to be 4 or 6
any other nearby pixel, producing complex 2 dimensional displacements, rather
than a simple 1 dimensional vector displacements. </p>
-<p>Alteratively rather than suppling two separate images, as of IM v6.4.4-0,
+<p>Alteratively rather than supplying two separate images, as of IM v6.4.4-0,
you can use the 'red' channel of the overlay image to specify the horizontal
or X displacement, and the 'green' channel for the vertical or Y displacement.
</p>
<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>JPEG/MIFF/PNG compression level.</td><td style='text-align:right;'></td></tr></table>
-<p>For the JPEG and MPEG image formats, quality is 1 (lowest image quality and highest compression) to 100 (best quality but least effective compression). The default is to use the estimate quality of your input image otherwise 92. Use the <a href="#sampling-factor">-sampling-factor</a> option to specify the factors for chroma downsampling.</p>
+<p>For the JPEG and MPEG image formats, quality is 1 (lowest image quality and
+highest compression) to 100 (best quality but least effective compression).
+The default is to use the estimated quality of your input image if it can
+be determined, otherwise 92. When the quality is greater than 90, then the
+chroma channels are not downsampled.
+Use the <a href="#sampling-factor">-sampling-factor</a> option to specify the
+factors for chroma downsampling.</p>
<p>For the MIFF image format, quality/10 is the zlib compression level, which is 0 (worst but fastest compression) to 9 (best but slowest). It has no effect on the image appearance, since the compression is always lossless.</p>
<p>For the JPEG-2000 image format, quality is mapped using a non-linear equation to the compression ratio required by the Jasper library. This non-linear equation is intended to loosely approximate the quality provided by the JPEG v1 format. The default quality value 100, a request for non-lossy compression. A quality of 75 results in a request for 16:1 compression.</p>
-<p>For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. The default PNG compression is 75.</p>
+<p>For the MNG and PNG image formats, the quality value sets the zlib
+compression level (quality / 10) and filter-type (quality % 10). The default
+PNG "quality" is 75, which means compression level 7 with adaptive PNG
+filtering, unless the image has a color map, in which case it means
+compression level 7 with no PNG filtering.</p>
+
+<p>For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression.</p>
-<p>If filter-type is 4 or less, the specified filter-type is used for all scanlines:</p>
+<p>If filter-type is 4 or less, the specified PNG filter-type is used for
+all scanlines:</p>
<pre class="text">
0: none
4: Paeth
</pre>
-<p>If filter-type is 5, adaptive filtering is used when quality is greater than 50 and the image does not have a color map, otherwise no filtering is used.</p>
+<p>If filter-type is 5, adaptive filtering is used when quality is greater
+than 50 and the image does not have a color map, otherwise no filtering is
+used.</p>
+
+<p>If filter-type is 6, adaptive filtering
+with <em class="arg">minimum-sum-of-absolute-values</em> is used.</p>
+
+<p>Only if the output is MNG, if filter-type is 7, the LOCO color
+transformation (intrapixel differencing) and adaptive filtering
+with <em class="arg">minimum-sum-of-absolute-values</em> are used.</p>
+
+<p>If the filter-type is 8 the zlib Z_RLE compression strategy is used with
+ no PNG filtering.</p>
-<p>If filter-type is 6, adaptive filtering with <em class="arg">minimum-sum-of-absolute-values</em> is used.</p>
+<p>If the filter-type is 9 the zlib Z_RLE compression strategy is used with
+ adaptive PNG filtering.</p>
-<p>Only if the output is MNG, if filter-type is 7, the LOCO color transformation and adaptive filtering with <em class="arg">minimum-sum-of-absolute-values</em> are used.</p>
+<p>The quality setting has no effect on the appearance or signature of PNG
+and MNG images, since the compression is always lossless.</p>
-<p>The quality setting has no effect on the appearance of PNG and MNG images, since the compression is always lossless.</p>
+<p>Not all combinations of compression level, strategy, and PNG filter type
+can be obtained using the -quality option. For more precise control,
+you can use the PNG:compression-level=N, PNG:compression-strategy=N, and
+PNG:compression-filter=N defines, respectively, instead.
+See <a href="#define">-define</a>. Values from the defines take precedence
+over values from the -quality option.</p>
-<p>For further information, see the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
+<p>For further information, see
+the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
<div style="margin: auto;">
<h4><a id="quantize"></a>-quantize <em class="arg">colorspace</em></h4>
projects / imagemagick / blobdiff