Hey,
I don't think my problem is caused by batik, but it is very clause related.
I would like to rasterize so that all browser show the transparency. Since
transparent png's aren't supported by the Internet Explorer, I want to use
gif's instead (in my case it doesn't matter that gif don't support alpha
transparency, because I only want the background to be transparent). To do
this I wrote a GIFTranscoder with the following function.
public void writeImage(BufferedImage img, TranscoderOutput output)
throws TranscoderException {
OutputStream ostream = output.getOutputStream();
new GifEncoder (img, ostream).encode ();
}
As GifEncoder I use the one from Acme (http://www.acme.com/java/software/).
This way I can rasterize gif's but they aren't transparent! Somehow the alpha
channel is for all pixels read in by the encoder set to 255, even though this
svg works with the PNGTranscoder. I don't use any filters (e.g. to reduce the
colors - right know the image doesn't have to much colors). It looks to me
that the ColorModel or the ImageConsumer which are used by the Encoder
somehow mess up the Alpha channel. But the Acme Encoder is suppose to support
transparent gif's. It sets all pixels with alpha < 128 to the transparent
color. But since alpha is somehow always 255 it doesnt work. Does anyone know
if it really supports transparent gif's? Has anyone generated transparent
gif's before?
I also tried the Gif89Encoder version (jmge.net/java/gifenc) and the pja
(www.eteks.com/pja/en/) version, with the same results.
cu
Roland Schulz
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