I am trying to combine two separate images into one larger image (each one
still discrete) and then I need to be able to put the resulting image
through some transformation, like an invert. One image is black & white (2
bits/pixel) and one is grayscale (4 bits/pixel). When I load each into a
BufferedImage, the grayscale loads as a TYPE_BYTE_BINARY and the black &
white as a TYPE_BYTE_GRAY. I then create the combined image as follows -
/* code sample */
BufferedImage combined = new BufferedImage( Math.max( grayImage.getWidth(),
bwImage.getWidth() ), grayImage.getHeight()+bwImage.getHeight(),
BufferedImage.TYPE_BYTE_GRAY );
Graphics2D g = combined.createGraphics();
g.drawImage( grayImage, null, 0, 0 );
g.drawImage( bwImage, null, 0, grayImage.getHeight() );
/* end of code sample */
After this, I pass the new image to a special JPanel I have created to
display the image. The resulting image displays just fine, however, if I
try to run an invert on it, the black & white image becomes completely
black, not inverted. Also, if I run it through a sharpening filter,
nothing seems to happen to the black and white image and the grayscale
image ends up looking like crap. Here is the code I use for invert and
sharpen -
/* 2nd code sample */
public void invert()
{
byte[] intensity = new byte[256];
for(int i=0; i<256; i++)
{
intensity[i] = (byte) (256 - i);
}
ByteLookupTable blt = new ByteLookupTable(0, intensity);
LookupOp op = new LookupOp(blt, null);
op.filter( imageToDisplay, imageToDisplay );
imagePanel.setImage( imageToDisplay );
}
public void sharpen()
{
float[] sharpenArray = { -1, -1, -1, -1, 9, -1, -1, -1, -1 };
Kernel kernel = new Kernel(3, 3, sharpenArray );
ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
cOp.filter(imageToDisplay, imageToDisplay );
imagePanel.setImage( imageToDisplay );
}
/* end of code sample */
Any thoughts on why I may be getting these strange results? Should I be using a
different image type for the combined image?
Any help would be greatly appreciated.
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