Hi all!
I have the following problem: I have a Buffered image, then I want to
transcode it into as small as possible format for
wireless transfer. The most suitable format is PNG and since the
wireless devices usually only support monochrome
images, I want to encode the image in this mode. Therefore I create an
IndexColorModel with two palette entries, black
and white. Then I call a colorConvertOp.filter(srcImg,destImg), where
destImage has the aforementioned monochrome
IndexColorModel. While this works procedure, it is still missing a
piece. The problem is the destImg looks quite bad, the
light parts of the image are totally white, while others are totally
black. What I want is a dithered BW image that would
show some "grayness".
The question is: how do I dither an image? Specifically, how do I dither
the image to two colors? I'm not familiar with
the dithering algorithm, so I was wondering if there is some
BufferedImageOp or RasterOp that can be configured to
pose as dithering operation? Can dithering be expressed as a convolution
or is it a totally another kind of operation? If
yes, can someone point me to an appropriate kernel, if not, does someone
have this operation implemented? I need a
Java algorithm, preferebly something that works hand-in-hand with
BufferedImage concepts.
Thanks in advance,
Samo
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