MagickStudio/Quality.html at main · ImageMagick/MagickStudio · GitHub

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<title>Quality Option</title>
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<center><img src="images/magick.png" align="bottom" width="114"
height="113" /></center>
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<p>This option is the JPEG/PNG/MIFF compression quality
setting.</p>
<p>For the JPEG image format, quality is 0 (worst) to 100 (best).
The default quality is 75.</p>
<p>Quality for the MIFF and PNG image format sets the amount of
image compression (quality / 10) and filter-type (quality % 10).
Compression quality values range from 0 (worst) to 100 (best). If
filter-type is 4 or less, the specified filter-type is used for all
scanlines:</p>
<pre class="text">
  0: none
  1: sub
  2: up
  3: average
  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 6 or more, adaptive filtering with
<em>minimum-sum-of-absolute-values</em> is used.</p>
<p>The default is quality is 75. Which means nearly the best
compression with adaptive filtering.</p>
<hr />
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