java 如何缩放 BufferedImage
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how do I scale a BufferedImage
提问by ewok
I have viewed this question, but it does not seem to actually answer the question that I have. I have a, image file, that may be any resolution. I need to load that image into a BufferedImageObject at a specific resolution (say, for this example, 800x800). I know the Image class can use getScaledInstance()to scale the image to a new size, but I then cannot figure out how to get it back to a BufferedImage. Is there a simple way to scale a Buffered Image to a specific size?
我已经查看了这个问题，但它似乎并没有真正回答我的问题。我有一个图像文件，可以是任何分辨率。我需要将该图像加载到BufferedImage特定分辨率的对象中（例如，在本例中为 800x800）。我知道 Image 类可以getScaledInstance()用来将图像缩放到新的大小，但是我无法弄清楚如何将它恢复为BufferedImage. 有没有一种简单的方法可以将缓冲图像缩放到特定大小？
NOTEI I do not want to scale the image by a specific factor, I want to take an image and make is a specific size.
NOTEII 不想按特定比例缩放图像，我想拍摄图像并制作特定尺寸。
回答by alain.janinm
Something like this? :
像这样的东西？：
/**
* Resizes an image using a Graphics2D object backed by a BufferedImage.
* @param srcImg - source image to scale
* @param w - desired width
* @param h - desired height
* @return - the new resized image
*/
private BufferedImage getScaledImage(Image srcImg, int w, int h){
BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TRANSLUCENT);
Graphics2D g2 = resizedImg.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2.drawImage(srcImg, 0, 0, w, h, null);
g2.dispose();
return resizedImg;
}
回答by Robert
You can create a new BufferedImage of the size you want and then perform a scaled paint of the original image into the new one:
您可以创建一个所需大小的新 BufferedImage，然后将原始图像按比例绘制到新图像中：
BufferedImage resizedImage = new BufferedImage(new_width, new_height, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(image, 0, 0, new_width, new_height, null);
g.dispose();
