Load png image and save it

I am loading a png file and saving it again with following code. The newly created image file is smaller size and poorer quality. How can I retain size and quality of the image?
===========================================
File input = new File(imgFilePath+"img1.png");
BufferedImage im = ImageIO.read(input);
Graphics2D g = im.createGraphics();
File output = new File(imgFilePath+"out2.png");
ImageIO.write(im,"png",output);
===========================================

Would a moderator please change this topic back to not solved.
@Noel: I tried exactly what you said, copying the image to itself so the source and target would be the same size. It does not work. I do understand that you respond to many posts and can't actually try to reproduce every issue. However, in this case, if you did try it on the posted image you would see that the problem is as I described it.
@Acidiclnk: Thank you for reproducing the problem. Unfortunately, I checked your response as the correct answer, but now realize that it does not solve the problem. What you suggest shifts the position of the image from its as loaded position. Then, as you said, copied images do register with the original. The problem is, the shifted image no longer lines up with the other maps of my texture.
It took me awhile to find the commands you described, as they are a bit different in my CS4 ("Align Layers to Selection > Vertical Centers", etc). When I tried them, the pasted image was correctly registered with the original. Unfortunately, as I mentioned, the image is no longer aligned with the other maps of the texture.
For this particular case, since there were large, uniform areas in the image, I temporarily added fiducial marks to the problem image and one of the other maps. Then, after copy/paste, I moved the shifted copy until it's fiducial was aligned with the other map, then removed the fiducals. (I could not use MTSTUNER's Duplicate Layer suggestion, since duplicating it to a new image created a new image with the same problem as the original).
To summarize: PhotoShop loads this image in one position, but aligning the centers or copy/paste moves it to another position. I would be happy to know why this is so. I did verfy that it's unique to PhotoShop as copy/paste works without the shift in another graphic editor. Any insights would be welcome.

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<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>
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<HR></BLOCKQUOTE>
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<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>
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