从3个字节的数组创建位图图像

Question

I would like to create bitmap image from three arrays of bytes: Range_R represents red color. Range_G represents green color. Range_B represents blue. How can I do this in android studio?

This my code but I'm not sure because the resulted image has bad different colors than the original image.

for (int i = 0; i < srcImg.getWidth(); i++) {
        for (int j = 0; j < srcImg.getHeight(); j++) {
            int pixel = srcImg.getPixel(i, j);
            byte Red = (byte) Color.red(Range_R[i][j]);
            byte Green = ((byte) Color.green(Range_G[i][j]));
            byte Blue = (byte) Color.blue(Range_B[i][j]);
            int alpha = Color.alpha(pixel);
            newimage.setPixel(i, j, argb(alpha,Red, Green, Blue));
        }
    }

Answer 1

Don't use Color.red()/green()/blue() here. Those are for extracting byte-sized values out of a larger bitfield ( int/long ). You've stated that these are byte arrays, therefor the values are already of the correct size, and likely, scale.

Also, you should make sure that Red , Green , and Blue are each in the range [0..255]. Some of the array members are likely negative; in this case, you will have to increase their value by 256:

if(Red < 0)
    Red += 256;

...and so forth. This is to meet the input specification of argb() .