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Updated Image IO (markdown)

Artem Pavlenko 2017-01-27 11:06:47 +01:00
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Image-IO.md

@ -93,7 +93,7 @@ And the key:value options can be controlled as follows:
| g | float, 1.0 - 2.0 | 2.0 | Not likely that you need to change this option. It is the gamma correction for pixel arithmetic in hextree method. 1.0 means no gamma correction |
| s | string, `default`, `filtered`, `huff`, or `rle` | `default` | Not likely that you need to change this option. It is the ZLIB compression strategy. See zlib docs for more details (available in Mapnik >= 2.x) |
| e | string, `miniz` or `libpng` | 'libpng` | REMOVED in Mapnik 3.0.10 |
| f | `no`,`all`,`fast` or a combination of `none`,`sub`,`up`,`avg`,`paeth` (for example ```f=sub|up|paeth```)| `none` | Filter algorithms that can be applied before compression. The purpose of these filters is to prepare the image data for optimum compression. Only useful for `truecolor` images (available in Mapnik >= 3.1) |
### WEBP output options
The WEBP API supports a lot of options and types of customization.