java 空白图片,使用Java裁剪/修剪具有空白空间的JPG文件

Is there a framework which is able to remove the white space (rectangular) of an image. We create Image Thumbnails from technical drawings which are unfortunately in PDF format. We convert the PDF to SVG and then to JPG. Often the technical drawings are very small and now placed in the upper left corner of the thumbnail:

+---------+----------------------+

| | |

| (image) | |

| | |

+---------+ |

| |

| |

| |

| |

| (empty space) |

| |

| |

+--------------------------------+

So how can I easily remove the empty space and shrink the JPG file?

解决方案

It can be done in JAI as is demonstrated in this thread. Or here's some Java code I just wrote which can be used to do it:

public class TrimWhite {

private BufferedImage