Hi, in middle of
http://docs.geotools.org/latest/userguide/tutorial/raster/image.html page there
is some code which is nice, but do not tell me who wrote it and where he live...
have look at it:
// We need at least three bands to create an RGB style
int numBands = cov.getNumSampleDimensions();
if (numBands < 3) {
return null;
}
I have lost best time of my life (oki, just a few hours) while replacing
"return null" with this:
// Now we create a RasterSymbolizer using colormap
ColorMap colorMap;
colorMap = sf.createColorMap();
RasterSymbolizer sym = sf.getDefaultRasterSymbolizer();
sym.setColorMap(colorMap);
return SLD.wrapSymbolizers(sym);
I do not know it it is good way, but it is working. Please improve that sample
on web for future generations of coders...
PS: I had problem with slow rendering of small map (~3000x1500 px). I have
tried png (800kB, 24bit color), bmp (not working, because of not supported by
image-ext -
http://java.net/downloads/imageio-ext/Documentation/gdalsupportedformats.html),
tif and horrible jpg (450kB). Best was my final solution, 16 color png (118kB)
file. Second was tiff without compression (37MB) and third tiff with
compression LZW (1.5MB). For my need of simple map it is now working fast.
If it would not hurt website, please try to write there some recommendation for
people that not full color png is good option for small home projects...
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