Hello raster experts,
out of an issue raised in gwc land, I wonder whether we can support semi
transparent 8 bit png images (I assume we just don't so far?).
A little investigation (as I was trying to reject the proposal of using the
pngquant external program to achieve this) suggests that what we need is to
use the NeuQuant quantization algorithm[1], and surprisingly it looks like
JAI actually supports it: <
http://download.oracle.com/docs/cd/E17802_01/products/products/java-media/jai/forDevelopers/jai-apidocs/javax/media/jai/operator/ColorQuantizerDescriptor.html
>
So question is has this even been considered, is known to (not)work? and if
yes, do you think we could add support for it in GeoServer?
Yeah the algorithm is known to be slower than the default median cut, a
price that the admin may be able to pay in exchange for higher quality png8
output?
TIA,
Gabriel
[1]<http://members.ozemail.com.au/~dekker/NEUQUANT.HTML>
--
Gabriel Roldan
OpenGeo - http://opengeo.org
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