Question

我需要一个int数组并将其转换为BufferImage。我真的没有任何关于这个主题的背景知识，我从互联网上学到了所有这些，所以这就是我想要做的：从BufferedImage（完成）创建数组，将此数组转换为IntBuffer（完成） - （稍后我需要通过IntBuffer对图像执行一些操作），将IntBuffer中更改的值放入新数组（完成），并将此数组转换为WritableRaster。（如果我对这个过程的描述不对，请告诉我）

这是我处理WritableRaster的行：

WritableRaster newRaster= newRaster.setPixels(0, 0, width, height, matrix);

Eclipse将此标记为错误并说''类型不匹配：无法从void转换为WritableRaster“

请帮忙！我有点失落。

也很抱歉英语不好。

编辑：矩阵：

         int height=img.getHeight();
         int width=img.getWidth();
         int[]matrix=new int[width*height];

我尝试将值插入Raster的代码部分：

    BufferedImage finalImg = new BufferedImage(width,height, BufferedImage.TYPE_INT_RGB);
    WritableRaster newRaster= (WritableRaster)finalImg.getData();
    newRaster.setPixels(0, 0, width, height, matrix);

错误消息：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 10769
at java.awt.image.SinglePixelPackedSampleModel.setPixels(Unknown Source)
at java.awt.image.WritableRaster.setPixels(Unknown Source)

Answer 1

您可以从WritableRaster数组创建BufferedImage和/或int，如下所示：

int w = 300;
int h = 200;
int[] matrix = new int[w * h];

// ...manipulate the matrix...

DataBufferInt buffer = new DataBufferInt(matrix, matrix.length);

int[] bandMasks = {0xFF0000, 0xFF00, 0xFF, 0xFF000000}; // ARGB (yes, ARGB, as the masks are R, G, B, A always) order
WritableRaster raster = Raster.createPackedRaster(buffer, w, h, w, bandMasks, null);

System.out.println("raster: " + raster);

ColorModel cm = ColorModel.getRGBdefault();
BufferedImage image = new BufferedImage(cm, raster, cm.isAlphaPremultiplied(), null);

System.err.println("image: " + image);

Answer 2

    ColorModel cm = ColorModel.getRGBdefault();
    int w = 300;
    int h = 200;
    WritableRaster raster = cm.createCompatibleWritableRaster(w, h);
    DataBufferInt buffer = (DataBufferInt) raster.getDataBuffer();
    int[] bufferData = buffer.getData();
    int[] array = new int[2400];
    Random random = new Random();
    for (int i = 0; i < 2400; i++) {
        array[i] = random.nextInt(2);
    }
    System.arraycopy(array, 0, bufferData, 0, (array.length < bufferData.length ? array.length : bufferData.length));
    BufferedImage image = new BufferedImage(cm, raster, false, null);
    FileOutputStream fos = new FileOutputStream("D:\\abc\\OCR\\" + "LearningRaster" + ".png");
    ImageIO.write(image, "PNG", fos);
    fos.close();

Answer 3

setPixels返回void：

public static void setPixels(BufferedImage img,
                         int x, int y, int w, int h, int[] pixels)

所以你需要创建Raster而不是设置像素：

WritableRaster newRaster= WritableRaster.createWritableRaster(…);
newRaster.setPixels(0, 0, width, height, matrix);

你需要为每个像素放置4个int（它取决于颜色模型，4个用于ARGB）。因此，矩阵大小必须

int[] matrix = new int[width * height * 4]

在此处查看有关WritableRaster的更多信息 -

Oracle: WritableRaster

Code examples

基于int数组创建WritableRaster

3 个答案: