Ridimensionare immagine

[abcd1000]

Devo ridimensionare un'immagine, utilizzo il seguente codice che funziona ma mi cambia i colori dell'imamgine
(l'immagine di partenza è un file jpg 640*480 con colori grigio e azzurro e mi ritrovo un'immagine 150*112 rossastra
Se non la ridimensiono i colori sono corretti, quindi è nel metodo getScaledInstance che c'è qualche problema.
sapete aiutarmi?

int newWidth = 150;
int newHeight = 112;

Image image = ImageUtil.getImageFromFile(fileImmagine);
Image resizedImage = image.getScaledInstance(newWidth, newHeight, Image.SCALE_SMOOTH);
BufferedImage bufferedResizedImage = ImageUtil.toBufferedImage(resizedImage);
ImageUtil.saveImage(bufferedResizedImage, nomeImmagineModificato,
						Constants.IMAGES_THUMB_PATH);

public static Image getImageFromFile(File file) throws IOException {
		Image image = ImageIO.read(file);
		return image;
	}

	// This method returns a buffered image with the contents of an 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
		// implementation, see e661 Determining If an Image Has Transparent
		// Pixels
		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;
	}

	// This method returns true if the specified image has transparent pixels
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();
	}

[abcd1000]

Ho provato anche usando il metodo

Image resizedImage = image.getScaledInstance(newWidth,
						newHeight, Image.SCALE_DEFAULT);

il risultato è uguale, l'immagine diventa rossastra

[mxa]

Io faccio cosi' e funziona:

private BufferedImage resize (BufferedImage source, int newWidth, int newHeight)
        {
            int w = source.getWidth();
            int h = source.getHeight();
            
            BufferedImage destination = new BufferedImage (newWidth, newHeight, source.getType());
            Graphics2D g2d = destination.createGraphics();
            g2d.setRenderingHint (RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2d.drawImage (source, 0, 0, newWidth, newHeight, 0, 0, w, h, null);
            g2d.dispose();
            return destination;
        }