Java BufferedImage Save saveImage(BufferedImage img, String targetfile)

Description

save Image

License

Open Source License

Declaration

public static void saveImage(BufferedImage img, String targetfile) throws Exception 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.awt.Graphics;

import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.HeadlessException;
import java.awt.Image;

import java.awt.Transparency;

import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.PixelGrabber;
import java.io.FileOutputStream;

import javax.swing.ImageIcon;

public class Main {
    /**// www  . ja v  a2s  . c  o m
     * Save image.
     * 
     * @param picture
     *            the picture
     * @param targetfile
     *            the targetfile
     * 
     * @throws Exception
     *             the exception
     */
    public static void saveImage(ImageIcon picture, String targetfile) throws Exception {
        BufferedImage img = toBufferedImage(picture.getImage());
        String image_format = "png";
        FileOutputStream out = new FileOutputStream(targetfile);
        javax.imageio.ImageIO.write(img, image_format, out);
        out.close();
    }

    public static void saveImage(BufferedImage img, String targetfile) throws Exception {
        String image_format = "png";
        FileOutputStream out = new FileOutputStream(targetfile);
        javax.imageio.ImageIO.write(img, image_format, out);
        out.close();
    }

    /**
     * To buffered image.
     * 
     * @param image
     *            the image
     * 
     * @return the buffered image
     */
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage) image;
        }

        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();

        // Determine if the image has transparent pixels; for this method's
        boolean hasAlpha = hasAlpha(image);

        // Create a buffered image with a format that's compatible with the
        // screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }

            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }

        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }

        // Copy image to buffered image
        Graphics g = bimage.createGraphics();

        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();

        return bimage;
    }

    /**
     * Checks for alpha.
     * 
     * @param image
     *            the image
     * 
     * @return true, if successful
     */
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage) image;
            return bimage.getColorModel().hasAlpha();
        }

        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
        PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }

        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }
}

Related

1. saveImage(BufferedImage image)
2. saveImage(BufferedImage img, String extension)
3. SaveImageToFile(BufferedImage bimg, String filename, String outformat)