FULL PRODUCT VERSION :
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
This bug:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4776576

seems to describe what's happening in 1.7.0_45 again.

  To see the output:
http://stackoverflow.com/questions/20789043/image-changes-color-when-saved-with-java


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.imageio.ImageIO;


public class ImageSaver {
    
    public static void main(final String url) {
        URL u = null;
        try {
            u = new URL(url);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        String file = url.substring(url.indexOf("//") + 2);
        Path filePath = Paths.get("c:/").resolve(file);
        try {
            Files.createDirectories(filePath.getParent());
            BufferedImage img = ImageIO.read(u);
            ImageIO.write(img, "jpg", filePath.toFile());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
q&d:

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

import javax.imageio.ImageIO;


public class ImageSaverWorkAround {
    
    public static void main(final String url) {
        URL u = null;
        try {
            u = new URL(url);
        } catch (MalformedURLException e) {
            e.printStackTrace();
        }
        String file = url.substring(url.indexOf("//") + 2);
        Path filePath = Paths.get("c:/").resolve(file);
        try {
            Files.createDirectories(filePath.getParent());
            Image img = Toolkit.getDefaultToolkit().createImage(url);
            while (img.getWidth(null) == -1 || img.getHeight(null) == -1) {
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
            int w = img.getWidth(null);
            int h = img.getHeight(null);
            int type = BufferedImage.TYPE_INT_RGB;
            BufferedImage pic = new BufferedImage(w, h, type);
            Graphics2D g2 = pic.createGraphics();
            g2.drawImage(img, 0, 0, null);
            g2.dispose();
            ImageIO.write(pic, "jpg", filePath.toFile());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}