我有一张尺寸为 16x6080 的图片。这是一个包含 16x16 部分的国家标志的堆叠图像。我的目标是从此图像中仅提取特定国家/地区的国旗并将其保存为自己的文件。这是我当前的代码
//Original Image
BufferedImage image = ImageIO.read(new File(countryImageNamePath));
System.out.println("Original Image Dimension: "+image.getWidth()+"x"+image.getHeight());
//Get the cropped image
BufferedImage out = image.getSubimage(0, 1808, 16, 16);
//Create a file to stream the out buffered image to
File croppedFile = new File(countryImagePath + countryName + ".gif");
//Write the cropped file
ImageIO.write(out, "gif", croppedFile);
产生的输出是
Original Image Dimension: 16x6080
Write File : C:\Applications\WorldCoinParser\images\country\US.gif
无论我为 Y 坐标输入什么值,我总是得到图像的顶部,从 x=0 和 y=0 开始,宽度和高度为 16。
有人看到我哪里搞砸了吗?
谢谢!
最佳答案
正如@MattPerry 所说,我们只需升级到 Java 7 就可以解决这个问题。
仅出于文档目的,错误似乎是这个 http://bugs.sun.com/view_bug.do?bug_id=6795544并影响了 Java 6。
The reason of problem here is that the optimized writing loop (utilized
direct access to image data buffer) does not take into account a data
band offset (which is non-trivial for sub-images, for example). It results
in writing image data starting from top left corner of the parent image
instead of expected top left corner of the sub-image.
We should take into account data bands offset, calculated by translated
raster instance.
我可以使用 JDK5 重现此错误
它与 JDK7 一起工作
关于java - 使用 java image.getSubimage 裁剪图像的问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15854069/