字节数组是这样获得的 -
BufferedImage image = new Robot().createScreenCapture(new Rectangle(screenDimension));
byte[] array = ((DataBufferByte)getGraycaleImage(image).getRaster().getDataBuffer()).getData();
// Method getGraycaleImage returns a grayscaled BufferedImage, it works fine
现在我如何从字节数组重建这个灰度图像?
我对 ARGB、RGB 或灰度图像了解不多。我尝试过这个 -
private Image getGrayscaleImageFromArray(byte[] pixels, int width, int height)
{
int[] pixels2=getIntArrayFromByteArray(pixels);
MemoryImageSource mis = new MemoryImageSource(width, height, pixels2, 0, width);
Toolkit tk = Toolkit.getDefaultToolkit();
return tk.createImage(mis);
}
private int[] getIntArrayFromByteArray(byte[] pixelsByte)
{
int[] pixelsInt=new int[pixelsByte.length];
int i;
for(i=0;i<pixelsByte.length;i++)
pixelsInt[i]=pixelsByte[i]<<24 | pixelsByte[i]<<16
| pixelsByte[i]<<8 | pixelsByte[i]; // I think this line creates the problem
return pixelsInt;
}
当我绘制这张图像时,它不是黑白的,而是橙色和灰色的东西。
您必须指定正确的ColorSpace
对应于灰度图像。
这是一个例子,可以在http://technojeeves.com/joomla/index.php/free/89-create-grayscale-image-on-the-fly-in-java http://technojeeves.com/joomla/index.php/free/89-create-grayscale-image-on-the-fly-in-java:
public static BufferedImage getGrayscale(int width, byte[] buffer) {
int height = buffer.length / width;
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
int[] nBits = { 8 };
ColorModel cm = new ComponentColorModel(cs, nBits, false, true,
Transparency.OPAQUE, DataBuffer.TYPE_BYTE);
SampleModel sm = cm.createCompatibleSampleModel(width, height);
DataBufferByte db = new DataBufferByte(buffer, width * height);
WritableRaster raster = Raster.createWritableRaster(sm, db, null);
BufferedImage result = new BufferedImage(cm, raster, false, null);
return result;
}
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