Jagged edges after rotation

Question

Hi Everyone,
I am try to rotate an image and put it on a background image. Image is being rotated successfuly but jagging appears if i use an small angle to rotate. I am also setting the Antialiasing using Rendering hints...
Please respond.
Thanks,
Masood
Following is the Code:
RenderingHints renderHints = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_DEFAULT);
renderHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
int value = 5;
int angle = (float)(value * (Math.PI/180.0F));
out = new BufferedImage(bsrc1.getWidth(), bsrc1.getHeight(), BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = out.createGraphics();
g2.setRenderingHints(renderHints);
//draw bg image
g2.drawRenderedImage(bsrc1, null);
at = AffineTransform.getTranslateInstance(width1+86-34,height1-30);
at.rotate(angle,612/2,486/2);
g2.drawRenderedImage(bsrc2,at);     
g2.dispose();

Answer 1

It's not an antialiasing process, it's interpolation. Try setting the interpolation key to bilinear or bicubinc - though the results still won't be ideal.
If that's not good enough then what you could do to get a fully smooth edge, if you're prepared to lose a pixel or two round the edge, is this:
- rotate the image
- create a quarilateral Shape which forms a rectangle around the new four corners
- turn on antialiasing
- using a stroke the same colour as your background, with a width of say 2 pixels, render the shape
This should give you a smooth edge but, as I say, you will lose a pixel or so round each edge, which may or may not be acceptable.