Hi Jan,
I had the same problem and couldn't find any quality settings. I did find
a protected method of transcoders: createRenderer(), which returns an
ImageRenderer. You can set Java2D rendering hints on this class. By
creating a simple subclass you can tell the ImageRenderer to use the
highest possible quality:
PNGTranscoder t = new PNGTranscoder()
{
@Override
protected ImageRenderer createRenderer()
{
ImageRenderer r = super.createRenderer();
RenderingHints rh = r.getRenderingHints();
rh.add(new RenderingHints(RenderingHints.KEY_ALPHA_INTERPOLATION,
RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC));
rh.add(new RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON));
rh.add(new RenderingHints(RenderingHints.KEY_COLOR_RENDERING,
RenderingHints.VALUE_COLOR_RENDER_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_DITHERING,
RenderingHints.VALUE_DITHER_DISABLE));
rh.add(new RenderingHints(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY));
rh.add(new RenderingHints(RenderingHints.KEY_STROKE_CONTROL,
RenderingHints.VALUE_STROKE_PURE));
rh.add(new RenderingHints(RenderingHints.KEY_FRACTIONALMETRICS,
RenderingHints.VALUE_FRACTIONALMETRICS_ON));
rh.add(new RenderingHints(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_OFF));
r.setRenderingHints(rh);
return r;
}
};
Regards,
Johan
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