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

我有一个包含来自 .bmp 文件的像素值的字节数组.它是通过这样做生成的:

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.我尝试创建一个 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.但我不知道该怎么做.我还尝试了 setDataElements 方法.但是我也不知道怎么用这个方法.

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.

谁能解释一下如何从字节数组创建 bmp 图像?

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

@Perception

@Perception

这是我目前所做的:

推荐答案

您需要将三个字节打包到您创建的每个整数中.根据缓冲图像的格式，这将是 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;
    }
}

您也可以使用 ByteBuffer.wrap(arr, offset, length).toInt()

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

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