java - 从一维数组构建图像

Question

我有一个一维数组像素，其中包含 512x512 灰度图像的像素值。我想把它写成一个png文件。我写了下面的代码，但它只是创建了一个空白图像。

    public void write(int width ,int height, int[] pixel) {

       try {
// retrieve image
BufferedImage writeImage = new BufferedImage(512,512,BufferedImage.TYPE_BYTE_GRAY);
File outputfile = new File("saved.png");
WritableRaster raster = (WritableRaster) writeImage.getData();
raster.setPixels(0,0,width,height,pixel);

ImageIO.write(writeImage, "png", outputfile);

} catch (IOException e) {

}

Answer 1

The Raster returned is a copy of the image data is not updated if the image is changed.

尝试将新的光栅对象设置回图像。

WritableRaster raster = (WritableRaster)writeImage.getData();
raster.setPixels(0, 0, width, height, pixel);
writeImage.setData(raster);