小编use*_*892的帖子

我在将带有透明像素的彩色图像转换为灰度时遇到问题.我在这个网站上搜索并发现了相关的问题,但我没有用来解决我的问题.

我已经定义了一个方法"convertType",如下所示:

/*------------------------------
attempts to convert the type of the image argument to the chosen type
for example: BufferedImage newImage= ImageUtilities.convertType(oldImage, BufferedImage.TYPE_3BYTE_BGR);
11/28/2013 WARNING-it remains to be seen how well this method will work for various type conversions
------------------------------*/
public static BufferedImage convertType (BufferedImage image,int newType){
 if (image.getType() == newType){
   return (image);
 }else {
    int w= image.getWidth();
    int h= image.getHeight ();
    BufferedImage modifiedImage = new BufferedImage( w,h,newType);
    Graphics2D g = ( Graphics2D)modifiedImage.getGraphics();
    g.drawImage( image, null, 0,0);
    g.dispose();
    return (modifiedImage);
} …