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Updated Api changes between v2.2 and v2.3 (markdown)

Dane Springmeyer 2014-08-12 13:42:06 -07:00
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Api-changes-between-v2.2-and-v2.3.md

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## Changed
- Default PNG output now is paletted using the high quality alpha-preserving `hextree` encoder (what used to be only possible with `png8:m=h`. This is now triggered when the `png` format string is used. Use `png32` to maintain rendering of full color rgba images as previously. More details at [this ticket](https://github.com/mapnik/mapnik/issues/2028) and [[Image-IO]]
- `colorize-alpha` filter now takes a single color argument (rather than requiring more than one) and will use this single color to paint in place of the existing alpha values.
- Text `label-position-tolerance` is now a `double` rather than `unsigned` (https://github.com/mapnik/mapnik/commit/dcbbcdd8a92d4d27176998d9a90a4c836b5174e2)