Image turns black after resizing MultipartFile in Java ..
I am trying to save file in sql db.. I need to down image quality and size because of memory..after resizing it gets black ..
any ideas?
private static int IMG_HEIGHT = 1280;
private static int IMG_WIDTH= 860;
private static int imgType = Image.SCALE_SMOOTH;
try {
byteArr = doc.getBytes();
ImageIcon imgIcon = new ImageIcon(byteArr);
int height = imgIcon.getIconHeight();
int width = imgIcon.getIconWidth();
if(height > IMG_HEIGHT || width > IMG_WIDTH){
int newWidth = width;
int newHeight = height;
if(height > IMG_HEIGHT){
newHeight = IMG_HEIGHT;
}
if(width > IMG_WIDTH){
newWidth = IMG_WIDTH;
}
System.out.println("Img newHeight = "+newHeight);
System.out.println("Img newWidth = "+newWidth);
Image newImage = imgIcon.getImage();
newImage = newImage.getScaledInstance(newWidth, newHeight, imgType);
BufferedImage buffImage = new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = buffImage.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2.drawImage(newImage, 0, 0, width, height, null);
// g2.setColor(Color.WHITE);
// g2.fillRect(0, 0, newWidth, newHeight);
// g2.setComposite(AlphaComposite.SrcOver);
// AffineTransform scaleTransform = AffineTransform.getScaleInstance(width / (double) newImage.getWidth(null), height / (double) newImage.getHeight(null));
// g2.drawImage(newImage, scaleTransform, null);
g2.dispose();
baos = new ByteArrayOutputStream();
ImageIO.write(buffImage,"jpg", baos);
I had a similar issue with images with transparent background. Just passing Color.WHITE
in graphics.drawImage
as a background color helped to avoid black background.
Graphics2D graphics = buffImage.createGraphics();
graphics.drawImage(newImage, 0, 0, IMAGE_WIDTH, IMAGE_HEIGHT, Color.WHITE, null);
graphics.setComposite(AlphaComposite.getInstance(AlphaComposite.DST_IN, 1.0f));
I used Scalr library and it solved my subject just in one line :)
BufferedImage thumbS = Scalr.resize(bImageFromConvert, Scalr.Method.BALANCED, IMG_HEIGHT, IMG_WIDTH, Scalr.OP_ANTIALIAS);
where bImageFromConvert is BufferedImage...
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