Question

我有由short[]表示的原始灰度图像像素。我想从中创建BufferedImage并将其另存为PNG。由于TYPE_SHORT_GRAY没有BufferedImage定义，我自己创建一个：

short[] myRawImageData;

// Create signed 16 bit data buffer, and compatible sample model
DataBuffer dataBuffer = new DataBufferShort(myRawImageData, w * h);
SampleModel sampleModel = new ComponentSampleModel(DataBuffer.TYPE_SHORT, w, h, 1, w, new int[] {0});

// Create a raster from sample model and data buffer
WritableRaster raster = Raster.createWritableRaster(sampleModel, dataBuffer, null);

// Create a 16 bit signed gray color model
ColorSpace colorSpace = ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorModel colorModel = new ComponentColorModel(colorSpace, false, false, Transparency.OPAQUE, DataBuffer.TYPE_SHORT);

// Finally create the signed 16 bit image
BufferedImage image = new BufferedImage(colorModel, raster, colorModel.isAlphaPremultiplied(), null);

try (FileOutputStream fos = new FileOutputStream("/tmp/tst.png")) {
    ImageIO.write(image, "png", fos);// <--- Here goes the exception
} catch (Exception ex) { 
    ex.printStackTrace();
}

到目前为止一直很好但是当我尝试使用ImageIO.write将其保存为PNG时，我得到了ArrayIndexOutOfBoundsException。

Answer 1

你的代码对我来说很好，我得到错误的唯一方法就是我改变了bandOffsets。你能给我们更多你的代码吗？

修改的如果数据集中包含负数据，则应该使用ushort而不是short。

    int h = 64, w = 64;
    short[] myRawImageData = new short[4096];
    for (int i = 0; i < 4096; i++){
        //this rolls over into negative numbers
        myRawImageData[i] = (short) (i * 14);
    }

    // Create signed 16 bit data buffer, and compatible sample model
    DataBuffer dataBuffer = new DataBufferUShort(myRawImageData, w * h);
    SampleModel sampleModel = new ComponentSampleModel(DataBuffer.TYPE_USHORT, w, h, 1, w, new int[] {0});

    // Create a raster from sample model and data buffer
    WritableRaster raster = Raster.createWritableRaster(sampleModel, dataBuffer, null);

    // Create a 16 bit signed gray color model
    ColorSpace colorSpace = ColorSpace.getInstance(ColorSpace.CS_GRAY);
    ColorModel colorModel = new ComponentColorModel(colorSpace, false, false, Transparency.OPAQUE, DataBuffer.TYPE_USHORT);

    // Finally create the signed 16 bit image
    BufferedImage image = new BufferedImage(colorModel, raster, colorModel.isAlphaPremultiplied(), null);

    try (FileOutputStream fos = new FileOutputStream("/tmp/tst.png")) {
        ImageIO.write(image, "png", fos);// <--- Here goes the exception
    } catch (Exception ex) {
        ex.printStackTrace();
    }

假设您认为负值是色域的较亮部分。

保存自定义BufferedImage

1 个答案: