http://www.imagemagick.org/discourse-server/viewtopic.php?&f=1&p=73548).
2011-06-29 6.7.0-7 Glenn Randers-Pehrson <glennrp@image...>
- * Handle "-quality 97" properly in the png encoder, .e., to use
- intrapixel filtering when writing a MNG file. and no filtering when
- writing a PNG file.
+ * Handle "-quality 97" properly in the png encoder, i.e., use intrapixel
+ filtering when writing a MNG file and no filtering when writing a PNG file.
* Added support for Z_RLE strategy in the png compressor, using
-quality 98 or 99.