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How to take pictures of a TV screen

How to take pictures of a TV screen - Taking pictures of images on a television screen is easy if you follow a few simple procedures. We tell you how to get good results from snapping TV screens here.

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Words and Pictures Peter Bargh ePHOTOzine

Taking pictures of images on a television screenBelieve it or not, one of the main reasons I took up photography was to take pictures off television. I was well into the cartoon character Snoopy from the Charlie Brown comics and when the series was played on TV my school friend brought in some pictures hed taken off the TV. I had to have a go and I set about it using my brothers Pentax S1. The results were a disaster grey, blurred, double exposures with a horrible diagonal line splitting the picture. Judging by pictures Ive seen over the years of televised events such as the Royal wedding, Glastonbury and the like many photographers have the same problem, and maybe gave up, but I didnt. Taking pictures off TV is easy if you apply a few simple techniques. Ive progressed in tastes since my childhood days of Snoopy and now prefer the sultry looks of the likes of Sarah Michelle Geller, more commonly known as Buffy the Vampire Slayer. Using Sarah as an example I will take you through the various problems you will face when trying to get a good TV picture.

Taking pictures of images on a television screenFirst lets look at why we get the diagonal line. In basic terms a television displays the image by projecting red, blue and green beams from the back of the cathode ray tube to the screen, which is coated with red, green and blue phosphors, arranged in dots or stripes. These are fired individually in lines across the screen and the beam moves from top to bottom in quick succession, with between 480 and 625 lines to complete a screen picture. It works so fast that our brain cannot distinguish the individual elements and creates a full colour image that looks fine. The camera however is not so clever. If you use a 1/30sec shutter speed or faster you will record the scanning effect, resulting in a band of phosphors that are not glowing with their respective colours. To ensure a complete picture we need a shutter speed of 1/25sec or slower.

Taking pictures of images on a television screenEnter problem two. Not only is there a phosphor refresh, but also the moving image is made up of around 16- 25 different pictures per second. If the subject is still you wont have a problem, but if it is moving you stand the chance of catching two or more of the moving frames in your exposure. This increases when you start to use slower shutter speeds, so the key is to get as close to 1/25sec as you can and with most cameras the ideal speed is 1/15sec, but with some TVs this can still cause a pattern.
Fortunately most of us have video recorders or DVD players and we can freeze the picture using the still frame method to get the exact frame you want to record.

Taking pictures of images on a television screenThe next problem youll encounter when using an automatic camera at these low light levels is it will trigger the flash and cause a reflection off the screen. Flash cannot be used, so you must use a camera with a flash off mode.
The slow shutter speed necessary will introduce camera shake too so makes sure the camera is resting on a table or tripod and position the camera so that the lens is aligned bang in the centre of the screen.

Taking pictures of images on a television screen

If you have a zoom lens step back and use the telephoto setting to avoid curved screen caused by the wide-angle lens distortion and if you have a TV with widescreen makes sure its set to 4:3 ratio to suit the film or CCD format.

Also close the curtains if youre trying to take pictures in daylight (you'll get reflections of the windows and room like I have done here) and turn off room lights in the evening to avoid unnecessary distractions.

Taking pictures of images on a television screenWhen I started taking pictures, we had a black & white TV (violins please) although my early pictures were grey and lacked contrast I wasnt concerned about a colour problem. This picture is almost there, but with a colour TV your pictures, like this, may have a predominant blue cast. This can be reduced by using a warm filter on a film camera or on digital cameras setting the colour balance to artificial light may help. The final shot below has been adjusted slightly using Photoshop to enhance contrast and touch up a final few unwanted relections that couldn't be avoided in this room.

Taking pictures of images on a television screen





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