Computer Lcd Tft
April 13, 2007 
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What settings do I need to take a clear photo of a computer (TFT/LCD) monitor?
I need to take some photos of a computer flat screen monitor (TFT/LCD). I had a go at it earlier with my dSLR, it comes out sharp and complete, but I get all sorts of colours and funky effects happening in certain areas - usually on white areas.
Could anyone shed some light on the best technique to do this?
Thank you for the answers so far.
I have had another go and I am still getting odd distortions and rainbow colouring, especially noticeable with white pixels. I'm finding that moving the camera into different positions causes different shape distortions, and in some places the rainbowing is reduced significantly.
Here is an example of the kind of distortions I'm talking about - http://www.flickr.com/photos/darren/35248887/ (this is not my own photo)
The refresh rate on TV's and computer monitors (CRT) is about 60 Hz. This means that it refreshes (redraws) the screen 60 times per second. Most LCD monitors refresh at higher rates (if they are analog) and therefore are easier to shoot at higher shutter speeds than you could use on a CRT. Now, it's all different if your monitor is digital (such as DVI) because the computer only updates the portions of the screen that changes.... such as where you are typing.... instead of the whole screen....
So... if it's CRT, you need a shutter speed lower than 1/60... preferably 1/15.... You could probably shoot an LCD connected by analog (such as VGA cables) at 1/60th and get away with it. A DVI connected LCD could be shot at pretty much any speed that gives you a good exposure.
****EDIT
OK, the distortions you are seeing are called a 'moire pattern'. It is usually created when you scan a screen printed image (such as in a magazine or newspaper). Digital photography is essentially scanning... you use a chip with a pattern of pixels on it... the patterns on the chip essentially line up with patterns on the monitor (pixel patterns) and create the new interference patterns you see there. The best way to avoid this would be to shoot straight on. Other than that, you could try a 'descreening' filter in photoshop (or maybe dust and scratches, or despeckle). Other than that, the patterns are unfortunately inherent in the technologies you are photographing... and what you are photographing it with.
Notebook 7" Touch Screen TFT LCD Google Android 1.6 Tablet PC WiFi (VIA MW8505/600MHz)
