这个问题其实是由于这条语句导致的错误 ImageIO.read(new File("watermark.png")), 0.5f),所以我们用bufferedimage构造就不会出现这个问题,下面
ImageWrapper imageWrapper = ImageReadHelper.read(inStream);这句代码引用的是阿里巴巴下的simpleimage里的方法,
public static void test1() {
try {
File in = new File("c:\\img\\in.jpg"); // 原图片
FileInputStream inStream = new FileInputStream(in);
ImageWrapper imageWrapper = ImageReadHelper.read(inStream);
Thumbnails.of(imageWrapper.getAsBufferedImage()).size(160, 160)
.toFile("c:\\img\\out.jpg");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SimpleImageException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
还有一种解决图片发红的问题
/**
* 生成图片带红的处理方法
* @param image
* @param width
* @param height
* @return
*/
public static BufferedImage toBufferedImage(Image image,int width,int height) {
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(width, height, 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(width, height, type);
}
// Copy image to buffered image
Graphics g = bimage.createGraphics();
// Paint the image onto the buffered image
g.drawImage(image, 0, 0,width,height, null);绘制缩小的图
g.dispose();
return bimage;
}