If you have ever tried taking pictures straight from your television screen, you might have sometimes noticed horizontal lines running up and down the picture. That is because a TV screen is "painted" one pixel at a time from top to bottom.

FOTO (pozri web link dole)
Shutter-Priority mode, Spot, 9.8mm, 1/90 sec., F3.2, ISO 80

simply use a shutter speed of 1/30 sec. and preferably slower. The idea is to use a shutter speed that synchronizes woth the the painting of the TV image and voila -- no moving horizontal lines.

You might want to experiment with different shutter speeds, such as 1/15 sec., 1/25 sec., (but less than 1/30 sec.) to see where you get optimum quality on your TV using your digital camera. Of course, to be able to set the shutter speed on your camera, you need to be able to switch to Shutter-Priority mode. The following pictures were taken with the Kodak Easyshare DX6490, and I find that a shutter speed of 1/15 sec. is optimum. With 1/30 sec., a few lines is apparent at larger image size.

For images of a computer screen, try 1/20 sec. and slower, and get a meter reading directly from the screen.

FOTO (pozri web)
Shutter-Priority, Spot, 9.8mm, 1/15 sec., F3.6, ISO 80

http://www.photoxels.com/tutorial_tv.html