Java将图像转换为BufferedImage

一尘不染

Java将图像转换为BufferedImage

java

在StackOverflow上已经存在类似此链接的问题，并且可接受的答案是“广播”：

Image image = ImageIO.read(new File(file));
BufferedImage buffered = (BufferedImage) image;

在我的程序中，我尝试：

final float FACTOR  = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = (BufferedImage) image;

不幸的是，我得到运行时错误：

sun.awt.image.ToolkitImage无法转换为java.awt.image.BufferedImage

显然，投射不起作用。
问题是：将Image转换为BufferedImage的正确方法是（或存在）什么？

阅读 1259

2020-03-24

共1个答案

一尘不染

从Java游戏引擎：

/**
 * Converts a given Image into a BufferedImage
 *
 * @param img The Image to be converted
 * @return The converted BufferedImage
 */
public static BufferedImage toBufferedImage(Image img)
{
    if (img instanceof BufferedImage)
    {
        return (BufferedImage) img;
    }

    // Create a buffered image with transparency
    BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);

    // Draw the image on to the buffered image
    Graphics2D bGr = bimage.createGraphics();
    bGr.drawImage(img, 0, 0, null);
    bGr.dispose();

    // Return the buffered image
    return bimage;
}

2020-03-24