Home/ Questions/Q 6531637
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-25T09:54:10+00:00

I need to add specific padding around large images and the current method I

  • 0

I need to add specific padding around large images and the current method I am using, as seen in the snippet below, is eating up memory. Opening the PNG sucks up ~300mb of memory right off the bat and making a copy of that pushes me past 700mb so I am looking for a way to do this without sucking up all available memory. Any suggestions?

...
BufferedImage img = ImageIO.read(new File("OldWorld.png"));
BufferedImage img2 = new BufferedImage(img.getHeight()+padding,img.getWidth()+padding, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = img2.createGraphics();
g2.setPaint(new Color(0,0,0,0);
g2.fillRect(0, 0, img.getHeight()+padding, img.getWidth()+padding);
g2.drawImage(img, img.getHeight(),img.getWidth(), null);
...
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    There is no direct way to solve this.
    Working with large images in Java consumes a lot of memory.

    Some alternatives are:

    1. Pre-process your images with the netpbm library
      http://netpbm.sourceforge.net/.
      To pad an image use a command like:

      pngtopnm OldWorld.png | pnmpad -black 48 -left 48 -top 48 | pnmtopng > padded.png

    2. Reduce the number of colors in your image so that you can use image type
      BufferedImage.TYPE_INDEXED with only one byte per pixel instead of four.

    3. Use a several tiles instead of a single large image and work
      with one tile at a time. Then you avoid having a lot of image
      data in memory.

    • 0