Given a rectangular input image I'd like to create an output image of size 40x40 pixels using a maximum of 10 colors. Hence, the two operatons needed are re-scaling and color reduction.
The following ImageMagick command does the trick:
convert input.png -scale 40x40 -colors 10 output.png
How would you achieve the corresponding result in Java?
Shelling out to ImageMagick is not an option :-)
Something like this would work using JAI:
// now resize the image
ParameterBlock pb = new ParameterBlock();
pb.addSource(image); // The source image
pb.add(wScale); // The xScale
pb.add(hScale); // The yScale
pb.add(0.0F); // The x translation
pb.add(0.0F); // The y translation
RenderingHints hints = new RenderingHints(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
RenderedOp resizedImage = JAI.create("SubsampleAverage", pb, hints);
// lastly, write the newly-resized image to an
// output stream, in a specific encoding
try
{
FileOutputStream fos = new FileOutputStream(new File(filename));
JAI.create("encode", resizedImage, fos, getImageType(filename), null);
ParameterBlock ParameterBlock pb = new ParameterBlock();
ColorModel cm = new ComponentColorModel(ColorSpace.getInstance(ColorSpace.TYPE_YCbCr), new int[] {8}, false, false, Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
pb.add(cm);
RenderedOp imgycc = JAI.create("ColorConvert", pb);
}
catch (FileNotFoundException e)
{
}
在jai.dev.java.net上查找Java Advanced Imaging(JAI)
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