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link to image_util.cpp

Dane Springmeyer 2013-10-04 12:06:27 -07:00
parent e5dbca6e30
commit 8dd968c7ce
1 changed files with 5 additions and 2 deletions
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Image-IO.md

@ -3,7 +3,7 @@ Mapnik supports reading and writing a variety of image formats.
These formats can be used as:
- Output formats for rendered map tiles
- Input formats for symbols or icons for symbolizers like the `MarkersSymbolizer`
- Input formats for symbols or icons for symbolizers like the [[MarkersSymbolizer]]
- Input formats for the [[Raster]] datasource plugin. Note: if you are looking for what raster geodata formats are supported see also what the [[GDAL]] datasource plugin supports.
## Format strings
@ -41,6 +41,9 @@ In Mapnik >= 2.3.x by default:
- PNG output is paletted png with no greater than 256 colors (aka. `png8`)
- JPEG output uses a `quality` of 85.
- TIFF output uses `PHOTOMETRIC_RGB` and `COMPRESSION_DEFLATE`
- WEBP output uses `WEBP_HINT_GRAPH` as an `image_hint` to indicate to the encoder that the image is likely a discrete tone image (this may change in the future) and otherwise uses WEBP encoder defaults.
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file for definitive defaults that are set for various encoders (as this wiki page may become out of date).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