ImageIO not able to write a JPEG file

user_11110 0
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I have a BufferedImage I'm trying to write to a jpeg file, but my Java program throws an exception. I'm able to successfully save the same buffer to a gif and png. I've tried looking around on Google for solutions, but to no avail.

Code:

   File outputfile = new File("tiles/" + row + ":" + col + ".jpg");
   try {
       ImageIO.write(mapBufferTiles[row][col], "jpg", outputfile);
   } catch (IOException e) {
        outputfile.delete();
        throw new RuntimeException(e);
   }

Exception:

 Exception in thread "main" java.lang.RuntimeException: javax.imageio.IIOException: Invalid argument to native writeImage
 at MapServer.initMapBuffer(MapServer.java:90)
 at MapServer.<init>(MapServer.java:24)
 at MapServer.main(MapServer.java:118)
 Caused by: javax.imageio.IIOException: Invalid argument to native writeImage
 at com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeImage(Native Method)
 at com.sun.imageio.plugins.jpeg.JPEGImageWriter.writeOnThread(JPEGImageWriter.java:1055)
 at com.sun.imageio.plugins.jpeg.JPEGImageWriter.write(JPEGImageWriter.java:357)
 at javax.imageio.ImageWriter.write(ImageWriter.java:615)
 at javax.imageio.ImageIO.doWrite(ImageIO.java:1602)
 at javax.imageio.ImageIO.write(ImageIO.java:1526)
 at MapServer.initMapBuffer(MapServer.java:87)
 ... 2 more
javax.imageio jpeg image java
5 Answers

2019 answer: Make sure your BufferedImage does not have alpha transparency. JPEG does not support alpha, so if your image has alpha then ImageIO cannot write it to JPEG.

Use the following code to ensure your image does not have alpha transparancy:

static BufferedImage ensureOpaque(BufferedImage bi) {
    if (bi.getTransparency() == BufferedImage.OPAQUE)
        return bi;
    int w = bi.getWidth();
    int h = bi.getHeight();
    int[] pixels = new int[w * h];
    bi.getRGB(0, 0, w, h, pixels, 0, w);
    BufferedImage bi2 = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
    bi2.setRGB(0, 0, w, h, pixels, 0, w);
    return bi2;
}
user_14327340

Here is some code to illustrate @Thunder idea to change the image type to TYPE_3BYTE_BGR

try {
  BufferedImage input = ImageIO.read(new File("input.png"));
  System.out.println("input image type=" + input.getType());
  int width = input.getWidth();
  int height = input.getHeight();
  BufferedImage output = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
  int px[] = new int[width * height];
  input.getRGB(0, 0, width, height, px, 0, width);
  output.setRGB(0, 0, width, height, px, 0, width);
  ImageIO.write(output, "jpg", new File("output.jpg"));
} catch (Exception e) {
  e.printStackTrace();
}
user_13053320
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