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Updated Image IO (markdown)

Dane Springmeyer 2014-08-12 13:41:23 -07:00
parent e6e2c4c470
commit d5ddf1c30f
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Image-IO.md

@ -38,11 +38,15 @@ As of Mapnik 2.3.x the following formats are supported:
In Mapnik >= 2.3.x by default: In Mapnik >= 2.3.x by default:
- PNG output is paletted png with no greater than 256 colors (aka. `png8`) - PNG output is full color png (aka. `png24` or `png32)
- JPEG output uses a `quality` of 85. - JPEG output uses a `quality` of 85.
- TIFF output uses `PHOTOMETRIC_RGB` and `COMPRESSION_DEFLATE` - TIFF output uses `PHOTOMETRIC_RGB` and `COMPRESSION_DEFLATE`
- WEBP output uses all WEBP encoder defaults meaning lossy compression (`lossless=0`) and a default quality of `75` (`quality=75`). - WEBP output uses all WEBP encoder defaults meaning lossy compression (`lossless=0`) and a default quality of `75` (`quality=75`).
In Mapnik >= 3.x by default:
- PNG output is paletted png with no greater than 256 colors (aka. `png8`)
See the C++ [image_util.cpp](https://github.com/mapnik/mapnik/blob/master/src/image_util.cpp) file for definitive defaults that are set for various encoders (as this wiki page may become out of date). See the C++ [image_util.cpp](https://github.com/mapnik/mapnik/blob/master/src/image_util.cpp) file for definitive defaults that are set for various encoders (as this wiki page may become out of date).
### TIFF output options ### TIFF output options