How can I overlay images over one another in Java?
- by Sam
So I have been posting all over and have yet to get a solid answer:
I have created an image resizing class, with a crop method. The cropping works great. The issue that I am having is the background color that I specify in the drawImage function of Graphics is not working correctly. It defaults to black as the background regardless of what I supply (in this case Color.WHITE).
Also, the overlaying image or top most image (comes from a file) is being inverted (I think it is) or otherwise discolored. Just so you can conceptualize this a little bit better, I am taking a jpeg and overlaying it on top of a new BufferedImage, the new buffered image's background is not being set. Here is the code below that I am working with:
public void Crop(int Height, int Width, int SourceX, int SourceY) throws Exception {
//output height and width
int OutputWidth = this.OutputImage.getWidth();
int OutputHeight = this.OutputImage.getHeight();
//create output streams
ByteArrayOutputStream MyByteArrayOutputStream = new ByteArrayOutputStream();
MemoryCacheImageOutputStream MyMemoryCacheImageOutputStream = new MemoryCacheImageOutputStream(MyByteArrayOutputStream);
//Create a new BufferedImage
BufferedImage NewImage = new BufferedImage(Width, Height, BufferedImage.TYPE_INT_RGB);
Graphics MyGraphics = NewImage.createGraphics();
MyGraphics.drawImage(this.OutputImage, -SourceX, -SourceY, OutputWidth, OutputHeight, Color.WHITE, null);
// Get Writer and set compression
Iterator MyIterator = ImageIO.getImageWritersByFormatName("png");
if (MyIterator.hasNext()) {
//get image writer
ImageWriter MyImageWriter = (ImageWriter)MyIterator.next();
//get params
ImageWriteParam MyImageWriteParam = MyImageWriter.getDefaultWriteParam();
//set outputstream
MyImageWriter.setOutput(MyMemoryCacheImageOutputStream);
//create new ioimage
IIOImage MyIIOImage = new IIOImage(NewImage, null, null);
//write new image
MyImageWriter.write(null, MyIIOImage, MyImageWriteParam);
}
//convert output stream back to inputstream
ByteArrayInputStream MyByteArrayInputStream = new ByteArrayInputStream(MyByteArrayOutputStream.toByteArray());
MemoryCacheImageInputStream MyMemoryCacheImageInputStream = new MemoryCacheImageInputStream(MyByteArrayInputStream);
//resassign as a buffered image
this.OutputImage = ImageIO.read(MyMemoryCacheImageInputStream);
}
