Java 按比例缩小图片应该怎么实现？

Java 按比例缩小图片应该怎么实现？

public Image resizeImg(Image img, int newWidth, int newHeight) {
int imgW = img.getWidth();
int imgH = img.getHeight();
int[] srcPixels = new int[imgW * imgH];
int[] destPixels = new int[newWidth * newHeight];
img.getRGB(srcPixels, 0, imgW, 0, 0, imgW, imgH);
int srcX;
int srcY;
for (int y = 0; y < newHeight; ++y) {
for (int x = 0; x < newWidth; ++x) {
srcX = (x * imgW) / newWidth;
srcY = (y * imgH) / newHeight;
destPixels[x + y * newWidth] = srcPixels[srcX + srcY * imgW];
}
}
return Image.createRGBImage(destPixels, newWidth, newHeight, true);
}

image srcimg = imageio.read(new fileinputstream(fnsrc) );//取源图 int width = 600; //假设要缩小到600点像素 int height = srcimg.getheight(null)*600/srcimg.getwidth(null);//按比例，将高度缩减 system.out.println("width: "+srcimg.getwidth(null));// 这几行是调试用 system.out.println("height: "+srcimg.getheight(null)); system.out.println("width2: "+width); system.out.println("height2: "+height); image smallimg =srcimg.getscaledinstance(width, height, image.scale_smooth);//缩小