Thank you Projection Moose !
John
----- Original Message -----
From: "Moose" <olymoose@xxxxxxxxx>
To: "Olympus Camera Discussion" <olympus@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, August 18, 2010 4:06 PM
Subject: Re: [OM] need advice re projecting images
> On 8/18/2010 11:32 AM, John Hudson wrote:
>> I have been requested to supply a few digital images for showing on a big
>> screen tv [let's say one of those 50" or 60" plasma tv's] using a laptop
>> as the projection / control / image sequencing device. There may be
>> upwards of 30 feet between the audience and the tv screen.
>>
>> An 800 x 600 pixel image at a 100 ppi resolution makes for a good web
>> based image.
>>
>> An 1800 x 1200 pixel image at 300ppi resolution makes a nice 6" x 4"
>> print.
>>
>> Can someone please advise me what pixel size and what ppi resolution is
>> required for a sharp big screen tv image viewed at upwards of a 30 foot
>> distance,
>
> First of all, ppi resolution is irrelevant to video images. You can prove
> it to yourself. Make one 800x600 at 300 ppi
> and another at 30 ppi. Both will be identical on your monitor.
>
> That's because the pixels are simply shown 1 to 1 on the screen. If you
> want to make an image or images a specific size
> in inches or mms on screen, you need to know the pixel pitch of the screen
> and to do that math. However, on another
> screen of different size or different pixel resolution, it will be a
> different physical size.
>
> It's the same for a TV. You find out the actual pixel resolution of the
> combination of computer output and TV and size
> your images to fit. They will then exactly fill the screen. It doesn't
> matter what physical size the screen is or how
> far away the audience is. The image is constrained by the TV and the
> device driving it.
>
> A full HD TV (1080) is 1920x1280 pixels, partial HD is 1280x720 (720).
> (The little letter after the vertical rez number
> means: i = interlaced, p = progressive. You needn't worry about that
> here.) So the maximum image size you might need is
> 1920x1280.
>
> However, you may also be limited by the video capabilities of the computer
> driving the TV. You should find out from the
> owner what the output pixel resolution of the computer is, and match your
> images to that.
>
> Anything other than matching image size to native resolution of the video
> output/tv combination will result in either an
> image too big or small or adjustment to fit it to screen that will usually
> result in poorer image quality. For example,
> most HDTVs have a display mode that stretches 720 images to 1080, to fill
> the screen with images from DVDs. Some DVD
> players have a similar function. But the on-screen result is not as good
> as an image properly sized to begin with.
>
> Projection Moose
>
>> jh
>>
>>
>>
>>
>>
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>> http://www.eset.com
>>
>>
>>
>
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> signature database 5377 (20100818) __________
>
> The message was checked by ESET Smart Security.
>
> http://www.eset.com
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>
>
__________ Information from ESET Smart Security, version of virus signature
database 5377 (20100818) __________
The message was checked by ESET Smart Security.
http://www.eset.com
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