Hi Eric,
> final BufferedImage buf = new BufferedImage(Math.round(fWidth*scale),
> Math.round(fHeight*scale), BufferedImage.TYPE_BYTE_BINARY, new
"Well, here's you problem". You're creating a binary image, with
only two possible colors. So the dithering can't be smooth by
definition - each color can only be black or white.
Thanks,
Dmitri
On Thu, May 11, 2006 at 09:00:27AM +0200, Erik Vanherck wrote:
> Hi,
>
> In a certain piece of code we were using Jai to dither a rendering of our
> chart objects, however this caused some performance issues and we noticed
> the RenderingHints.KEY_DITHERING so we tried moving the dithering into the
> rendering of the chart that was already using the graphics2D of a
> bufferedImage. While very performant, it doesn't yield the expected
> result. Instead of dithered it gives us a thresholded black and white
> image. I found very little information about the dithering hint while
> googling and searching the forums, except people asking how to turn it off
> ;-)
>
> Now my question is, should the pseudo code below work ?
>
> <--- code snippet --->
>
> byte[] map = {(byte)0xFF, (byte)0x00};
> final BufferedImage buf = new BufferedImage(Math.round(fWidth*scale),
> Math.round(fHeight*scale), BufferedImage.TYPE_BYTE_BINARY, new
> IndexColorModel(1,2,map,map,map));
> final Graphics2D g2 = (Graphics2D)buf.getGraphics();
> g2.setRenderingHint(RenderingHints.KEY_DITHERING,RenderingHints.VALUE_DITHER_ENABLE);
> g2.scale(scale,scale);
> fChart.setGraphics2D(g2);
> fChart.render();
> return buf;
>
> <--- code snippet --->
>
> For reference we are using jdk 1.4.2_08 and any solution should work in
> java.awt.headless mode.
>
> Any feedback is highly appreciated
>
> Best regards,
> Erik
>
>
> Erik Vanherck - Product Delivery Manager
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