To take a screen shot i hold the lock button and home key. I did this to capture an image during a paused video on my phone. I tried to view it in my photo gallery and the 3 screenshots i took were blackedout. In one, the video option bar was visible, but still the video image was balck. I closed the gallery and re opened it a few times and still no images. Why is this and what do i do to successfully take a screenshot duing a paused video?