直接调用构造函数

//指定宽高、图像字节灰度 BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_BYTE_GRAY) //创建一个不带透明色的对象 BufferedImage bimage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); //创建一个带透明色的对象 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);

根据已经存在的BufferedImage对象创建一个copy体

public BufferedImage createBufferedImage(BufferedImage src)

通过创建ColorModel（颜色转换为Java中的像素表示）和Raster（光栅，描述像素的）对象创建BufferedImage对象

public BufferedImage createBufferedImage（int width , int height, byte[] pixels）{ //pixel像素

ColorModel cm = getColorModel();

SampleModel sm = getIndexSampleModel((IndexColorModel)cm, width,height);

DataBuffer db = new DataBufferByte(pixels, width*height,0);

WritableRaster raster = Raster.creatWritableRaster(sm, db,null);

BufferedImage image = new BufferedImage (cm, raster,false, null);

return image;

}

读取一个图片文件来转换.

BufferedImage image = ImageIo.read(new FileInputStream(filePath));