如何从java中的像素字节数组制作bmp图像 [英] How to make bmp image from pixel byte array in java

问题描述

我有一个字节数组，其中包含来自.bmp文件的像素值.它是通过执行以下操作生成的:

I have a byte array containing pixel values from a .bmp file. It was generated by doing this:

BufferedImage readImage = ImageIO.read(new File(fileName));
byte imageData[] = ((DataBufferByte)readImage.getData().getDataBuffer()).getData();

现在，我需要重新创建.bmp图像.我试图制作一个BufferedImage并通过调用setPixels方法设置WritableRaster的像素.但是我必须提供一个int []，float []或double []数组.也许我需要将字节数组转换为其中之一.但是我不知道该怎么做.我还尝试了setDataElements方法.但是我也不知道如何使用这种方法.

Now I need to recreate the .bmp image. I tried to make a BufferedImage and set the pixels of the WritableRaster by calling the setPixels method. But there I have to provide an int[], float[] or double[] array. Maybe I need to convert the byte array into one of these. But I don't know how to do that. I also tried the setDataElements method. But I am not sure how to use this method either.

任何人都可以解释如何从字节数组创建bmp图像吗?

Can anyone explain how to create a bmp image from a byte array?

@Perception

@Perception

这是我到目前为止所做的:

This is what I have done so far:

问题是，这仅适用于灰色图像，但是对于彩色图像，颜色是不正确的.我认为这与byteToInt方法有关.如果有人知道如何改进它或有一个新的更简单的解决方案，我们将为您提供帮助.:)

The thing is this works just fine for gray images, but for colored images the color is not correct. I think this is something to do with the byteToInt method.. If someone knows how to improve it or have got a new and easier solution, ur help will be appreciated.. :)

推荐答案

您需要将三个字节打包成每个整数.根据缓冲图像的格式，该值为0xRRGGBB.

You need to pack three bytes into each integer you make. Depending on the format of the buffered image, this will be 0xRRGGBB.

byteToInt必须像这样消耗三个字节:

byteToInt will have to consume three bytes like this:

private int[] byteToInt(byte[] data) {
    int[] ints = new int[data.length / 3];

    int byteIdx = 0;
    for (int pixel = 0; pixel < ints.length) {
        int rByte = (int) pixels[byteIdx++] & 0xFF;
        int gByte = (int) pixels[byteIdx++] & 0xFF;
        int bByte = (int) pixels[byteIdx++] & 0xFF;
        int rgb = (rByte << 16) | (gByte << 8) | bByte
        ints[pixel] = rgb;
    }
}

您还可以使用

You can also use ByteBuffer.wrap(arr, offset, length).toInt()

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