1、本文仅为了提供图片上传过程中,部分java图片处理代码。
2、以下代码可以解决部分图片上传裁剪后整体变红等失真现象。
3、以下代码支持cmyk颜色模式的图片上传裁剪。
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/** * 图片裁剪
* @param srcImageFile 裁剪前图片地址
* @param dirImageFile 裁剪后图片地址
* @param x 图片裁剪属性
* @param y 图片裁剪属性
* @param destWidth 图片裁剪属性
* @param destHeight 图片裁剪属性
*/
public static void abscut(String srcImageFile,String dirImageFile, int x, int y, int destWidth, int destHeight) {
BufferedImage bi= null ;
try {
ImageFilter cropFilter;
Image img = Toolkit.getDefaultToolkit().getImage(srcImageFile); //可讀取丟失ICC信息的圖片(裁剪后图片变红等现象的原因)
bi = toBufferedImage(img);
int srcWidth = bi.getWidth();
int srcHeight = bi.getHeight();
if (srcWidth >= destWidth && srcHeight >= destHeight) {
Image image = bi.getScaledInstance(srcWidth, srcHeight,
Image.SCALE_DEFAULT);
cropFilter = new CropImageFilter(x, y, destWidth, destHeight);
img = Toolkit.getDefaultToolkit().createImage(
new FilteredImageSource(image.getSource(), cropFilter));
BufferedImage tag = new BufferedImage(destWidth, destHeight,
BufferedImage.TYPE_INT_RGB);
Graphics g = tag.getGraphics();
g.drawImage(img, 0 , 0 , null );
g.dispose();
ImageIO.write(tag, "jpg" , new File(dirImageFile));
}
} catch (Exception e) {
System.out.println( "ImageUtils图片裁剪异常:" +e.getLocalizedMessage());
}
}
/**
* Image 转 BufferedImage
* @param image
* @return
*/
public static BufferedImage toBufferedImage(Image image) {
if (image instanceof BufferedImage) {
return (BufferedImage)image;
}
// This code ensures that all the pixels in the image are loaded
image = new ImageIcon(image).getImage();
// Determine if the image has transparent pixels; for this method's
// implementation, see e661 Determining If an Image Has Transparent Pixels
//boolean hasAlpha = hasAlpha(image);
// Create a buffered image with a format that's compatible with the screen
BufferedImage bimage = null ;
GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
try {
// Determine the type of transparency of the new buffered image
int transparency = Transparency.OPAQUE;
/* if (hasAlpha) {
transparency = Transparency.BITMASK;
}*/
// Create the buffered image
GraphicsDevice gs = ge.getDefaultScreenDevice();
GraphicsConfiguration gc = gs.getDefaultConfiguration();
bimage = gc.createCompatibleImage(
image.getWidth(null), image.getHeight(null), transparency);
} catch (HeadlessException e) {
// The system does not have a screen
}
if (bimage == null) {
// Create a buffered image using the default color model
int type = BufferedImage.TYPE_INT_RGB;
//int type = BufferedImage.TYPE_3BYTE_BGR;//by wang
/*if (hasAlpha) {
type = BufferedImage.TYPE_INT_ARGB;
}*/
bimage = new BufferedImage(image.getWidth( null ), image.getHeight( null ), type);
}
// Copy image to buffered image
Graphics g = bimage.createGraphics();
// Paint the image onto the buffered image
g.drawImage(image, 0 , 0 , null );
g.dispose();
return bimage;
}
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本文转自 艺晨光 51CTO博客,原文链接:http://blog.51cto.com/ycgit/1735974,如需转载请自行联系原作者