On Friday, July 4, 2003, at 12:41 PM, Andrew Holt wrote:
Hello again to the ether of knowledge and wisdom
Can anyone remember what maximum shutter speed you need in order to prevent dark bands appearing on a computer screen when it is photographed?
Greetings,
I have always shot computer screens at 1/4 second and have never had any banding problems. Use a tripod, obviously, and make sure that the room is as dark as possible to eliminate any potential glare on the screen. If you can't darken the room, use a dark focusing cloth or something to make a tent to block any ambient light.
I don't know what your application for the image is, but recently I worked on a project for a client to produce a presentation on a new wireless digital X-ray system currently being offered for general dental and endodontic use. He wanted to show an X-ray image on the screen along with the graphical interface of the software to show the many options that traditional X-rays can't offer. All I did was take screen grabs of what he wanted and it worked perfectly.
In Mac OS X you go into the applications folder --> utilities --> choose "screen" from the capture menu --> when the grab window opens you click outside the box to capture the screen. Certainly creates a fine enough image to be used in Powerpoint or the web. Might even be able to get away with it in print if the image is going to be small. I know that Windows can screen grab as well, but I'm not sure how to do it there.
Hope this helps.
-Ben
Senior Medical Photographer Medical Photography & Media Design Services Sinai Hospital of Baltimore
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