Hi John,
I figured out similar problems at the beginning, but I finally found a
solution without any problem.
Here my solution, which works also for greyscales ... as an example for
GAUSS operators ...
The method returns a BufferedImage of the same type as you Src Image. Since
you sent over only a part of your program and it seems that you provide a
container for your images, their might be something wrong from this side.
static public BufferedImage doGaussOp(BufferedImage bSrc, float sigma) {
// create a GaussKernel ... here you can do whatever is fine for your filter
float f[] = createGaussKernelData(sigma);
int fsize = (int) Math.sqrt(f.length);
Kernel kernel = new Kernel (fsize,fsize,f);
ConvolveOp m = new ConvolveOp(kernel);
// new
RenderingHints(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_OFF));
BufferedImage bDest = IPL.createCopy(bSrc);
WritableRaster ras = bSrc.getRaster();
WritableRaster aim= bDest.getRaster();
m.filter(ras,aim);
return bDest;
> I have a grayscale image stored in a BufferedImage as TYPE_BYTE_GRAY that
> I
> want to run through a sharpening filter. However, the results I get when
> doing this in Java is far inferior to what I get when I load the image in
> Paint Shop Pro (PSP) and run it through a sharpen filter in this
> application. I have a few thoughts on why this might be -
>
> 1. Before I can sharpen the image in PSP I am forced to increase its
> color
> depth to 24 bits (16 million colors). So, perhaps there is some way I can
> increase the color depth of my BufferedImage in Java before I do the
> sharpen operation.
>
> 2. There is something wrong with my sharpen code. Here it is -
>
> public void sharpen()
> {
> float[] sharpenArray = { 0, -1, 0, -1, 5, -1, 0, -1, 0 };
>
> Kernel kernel = new Kernel(3, 3, sharpenArray );
> ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP,
> null);
> imageToDisplay = cOp.filter(imageToDisplay, null );
> imagePanel.setImage( imageToDisplay );
> }
>
>
> 3. It is not possible to obtain results equal to a professional image
> editing program through the standard Java2D APIs (I hope this is not the
> case).
>
> Any thoughts on how to improve the sharpen results would be greatly
> appreciated...
>
> Thanks.
>
> John
>
>
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