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Updated RasterSymbolizer (markdown)

ThomasG77 2011-12-17 18:54:07 -08:00
parent bab8e54c67
commit fe5692f2c0
1 changed files with 29 additions and 32 deletions
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RasterSymbolizer.md

@ -25,7 +25,7 @@ Processed as described in http://wiki.openstreetmap.org/wiki/Hillshading_using_t
# Usage
| *parameter* | *value* | *description* |
--------------|---------|-----------|
|--------------|---------|-----------|
| opacity | 0.0 - 1.0 | 1 is fully opaque while zero is fully transparent and .5 would be 50% transparent |
| mode | grain_merge, grain_merge2, multiply, multiply2, divide, divide2, screen, hard_light | Compositing/Merging effects with image below raster level (?). The formulas for combinding foreground (raster) and background are: grain_merge: bg + fg - 0.5, grain_merge2: bg + 2*fg - 1.0, multiply: fg * bg, multiply2: 2 * fg * bg, divide: bg / fg, divide2: 2*bg / fg, screen: (1-fg)*(1-bg), hardlight: see [[http://docs.gimp.org/en/gimp-concepts-layer-modes.html#id2834930]] |
| scaling | fast, bilinear, bilinear8 || fast: nearest neighbour, bilinear: bilinear interpolation for all 4 channels (RGBA), bilinear8 like bilinear, but only one channel assumed |
@ -46,7 +46,6 @@ Default (simply renders a copy of the raster)
```xml
#!xml
<Style name="My Style">
<Rule>
<RasterSymbolizer/>
@ -57,7 +56,7 @@ Default (simply renders a copy of the raster)
Using the new 0.6.0 release opacity / merging / scaling options:
```xml
#!xml
<Style name="raster">
<Rule>
<RasterSymbolizer>
@ -81,9 +80,7 @@ Using the new 0.6.0 release opacity / merging / scaling options:
## Python Styles
```python
#!python
s = Style()
r=Rule()
r.symbols.append(RasterSymbolizer())