如该线程所示，可以在JAI中完成。或者这是我刚刚编写的一些Java代码，可用于执行此操作：
public class TrimWhite { private BufferedImage img; public TrimWhite(File input) { try { img = ImageIO.read(input); } catch (IOException e) { throw new RuntimeException( "Problem reading image", e ); } } public void trim() { int width = getTrimmedWidth(); int height = getTrimmedHeight(); BufferedImage newImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = newImg.createGraphics(); g.drawImage( img, 0, 0, null ); img = newImg; } public void write(File f) { try { ImageIO.write(img, "bmp", f); } catch (IOException e) { throw new RuntimeException( "Problem writing image", e ); } } private int getTrimmedWidth() { int height = this.img.getHeight(); int width = this.img.getWidth(); int trimmedWidth = 0; for(int i = 0; i < height; i++) { for(int j = width - 1; j >= 0; j--) { if(img.getRGB(j, i) != Color.WHITE.getRGB() && j > trimmedWidth) { trimmedWidth = j; break; } } } return trimmedWidth; } private int getTrimmedHeight() { int width = this.img.getWidth(); int height = this.img.getHeight(); int trimmedHeight = 0; for(int i = 0; i < width; i++) { for(int j = height - 1; j >= 0; j--) { if(img.getRGB(i, j) != Color.WHITE.getRGB() && j > trimmedHeight) { trimmedHeight = j; break; } } } return trimmedHeight; } public static void main(String[] args) { TrimWhite trim = new TrimWhite(new File("...\someInput.bmp")); trim.trim(); trim.write(new File("...\someOutput.bmp")); }}
