反转c中的图像强度

Question

void invert( uint8_t array[], 
         unsigned int cols, 
         unsigned int rows )
{
    int y;
    uint8_t darkest = 255;
    uint8_t lightest = 0;
    uint8_t anygray = y;
    for (int x = 0; x < (cols*rows); x++)
    {
        for (y = 0; y < (cols*rows); y++)
        {
            if (array[x] == darkest && array[x] == anygray && array[x] == lightest)
            {
                array[x] = 255-y;
            }
        }
    }
}

I have a function here that inverts the image intensities, so that black becomes white, and vice versa as well as all the light grays become dark grays. But my code here doesn't seem to work and I don't know where i went wrong. Would anybody be able to help me out?

Answer 1

I haven't prototyped anything to check but I see at least two things that look suspicious.

1) I expected the && in the IF to be ||.

2) I expected array[x] = 255 - y to be something like array[x] = 255 - array[x].