使用ImageIO.write jpg文件的问题:粉红色的背景

Question

我正在使用以下代码编写jpg文件:

String url="http://img01.taobaocdn.com/imgextra/i1/449400070/T2hbVwXj0XXXXXXXXX_!!449400070.jpg";
String to="D:/temp/result.jpg";
ImageIO.write(ImageIO.read(new URL(url)),"jpg", new File(to));

但我得到的result.jpg是一个粉红色的背景图片:

Answer 1

您可以通过使用Toolkit.createImage(url)而不是ImageIO.read(url)使用解码算法的不同实现来解决此问题.

如果您使用的是Sun JDK附带的JPEG编码器,那么您还必须确保将没有Alpha通道的图像传递给它.

例:

private static final int[] RGB_MASKS = {0xFF0000, 0xFF00, 0xFF};
private static final ColorModel RGB_OPAQUE =
    new DirectColorModel(32, RGB_MASKS[0], RGB_MASKS[1], RGB_MASKS[2]);

    // ...

String sUrl="http://img01.taobaocdn.com/imgextra/i1/449400070/T2hbVwXj0XXXXXXXXX_!!449400070.jpg";
URL url = new URL(sUrl);
Image img = Toolkit.getDefaultToolkit().createImage(url);

PixelGrabber pg = new PixelGrabber(img, 0, 0, -1, -1, true);
pg.grabPixels();
int width = pg.getWidth(), height = pg.getHeight();

DataBuffer buffer = new DataBufferInt((int[]) pg.getPixels(), pg.getWidth() * pg.getHeight());
WritableRaster raster = Raster.createPackedRaster(buffer, width, height, width, RGB_MASKS, null);
BufferedImage bi = new BufferedImage(RGB_OPAQUE, raster, false, null);

String to = "D:/temp/result.jpg";
ImageIO.write(bi, "jpg", new File(to));

注意:我的猜测是颜色配置文件已损坏,并Toolkit.createImage()忽略所有颜色配置文件.如果是这样,那么这将降低具有正确颜色配置文件的JPEG的质量.

Answer 2

我有类似的问题.但后来我用这个来解决它

   BufferedImage image = new BufferedImage(width, height,
            BufferedImage.TYPE_INT_RGB); 

   //do something to populate the image
   //such as
   image.setRGB( x, y, pixelValue); //set your own pixels color



   ImageIO.write(image, "jpg", new File("D:\\test.jpg"));

请注意,我使用的是Java版本1.6.0_25-b06,它运行正常.

也许你可以查看Java版本.

Answer 3

这对我有用:

int w = originalImage.getWidth();
int h = originalImage.getHeight();
BufferedImage newImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
int[] rgb = originalImage.getRGB(0, 0, w, h, null, 0, w);
newImage.setRGB(0, 0, w, h, rgb, 0, w);