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optimum image size for puibl;ic slide show


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<p>I am presenting to the lions club this sat and projecting my images of my backpacking trip from capetown to cairo overland ( i'm 74)and about my kidnapping and cut throat in tanzamia by a somali gang and my escape<br>

but my life or death question now is what is the best image size for my pics.<br>

Right now they are about 4.56 MB 3888 x 2592 what should i resize them ? is it necessary?<br>

also i have a few in web size i sent on route at 46kb but orignials were stolen are they projectable on a public screenscreen 9' x 9'?<br>

(If you want to read my toronto star story just google "I'm 74 and I backpacked across africa" it will pop up on dozens of sites. Email me if you wan t the kidnappinhg story)</p>

<p>jerry</p>

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<p>A lot depends on the projector used. Find out what type it is and look up it's maximum resolution. It may not be needed to re-size the images but the projector will only project it's max resolution and, depending on how many images in your show and software used, big files could bog down the slideshow software/hardware. Having the show on the hard disk will be helpful as opposed to running it from an optical disk. On a high end projector, 1200-1600 pixels on the long axis should get you there. On small projectors, 600-800 pixels might be enough. Or pick a mid-value if the equipment is unknown. Images that are somewhat less than max hardware resolution will still project a decent image.</p>
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Totally confused now . If I have an image reading 4.56 mb 3888x 2592. Shot with a canon rebel I want to project to

an audience of 80. With a screen size of about 10' x 10' with a standard hotel digital projector used for conference

sessions . Can I make a good bet and resize 1024x 762? If I di that total goes down to 600 - 700 kb. I am doing

something wrong!

Time is running out and I am getting up tight about what I should canna alk these images too. I am showing them

quite fast so I don't l

Need slow loading problems

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<p>No ... since I would expect files prepared for showing to be around 300Kb ... thats at 1400x1050 or 1400x 933 for DSLR files ... but that is using a top line projector I gather at Club.<br>

Those web files with lost masters .. I suggest you interpolate up to the 1024x762 and see what they look like .. they could be quite reasonable particularly when projected with the audience a reasonable distance back from the screen, at least those at the back will not notice any problem probably :-)<br>

You say the file size are 46<120 but the important question is to what resolution did you resize them? I would normally send 700 wide images to fit or almost fit freinds monitors so interpolating up to 1024 is not that much.</p>

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<p>The 10x10 screen size doesn't really come into it but more to the point is how close will the audience be ... pretty much the same as looking at a print at a reasonable distance and pixel peeping. or looking at a billboard close-up ... looks horrible but from across the street its great. Basically we are dealing with .... when we project but we have to live with the current state of the art, and becuase usually the audience is some way back we get away with it.</p>
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<p>File size is not the most important consideration in a good presentation. Decades ago, when China was mostly closed to Americans, an American doctor's wife took extensive photos in China with a 110 camera. The slides were projected onto a fairly large screen. Of course the photos were awfully grainy and unsharp, but aside from that, they were well composed, well exposed, and accompanied by an informative and entertaining talk. It was a fine presentation. Sharp and technically perfect images with no content and presented with dull words would have compared poorly with that show. If 46kb images are important to your presentation, use them. Perhaps brief mention of the necessity of showing them will add to the talk. Only if you do the same show for a camera club, editing for image quality rather than for the complete story might be better.</p>
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<p> i guess i am having trouble woith the math. if i take a 5mb image that is 3888x 2592 and resize it to 1024 x 768<br>

my 5mb suddenly becomes 195 kb! is that not a huge loss in quality? I am best to resize to 1024 x 768 or resize by 50% which give me a larger file size than at 1024 resizing.<br>

I guess i am searching for the optimum quality image while not restricting speed of image change or reloading .<br>

is a 1024 x 768 image 0f 195 kb good enough?</p>

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<p>Jerry,</p>

<p>The pixel dimensions 1024 x 768 are fine. I'm not familiar with Microsoft Viewer but I suspect it is not very sophisticated in how it resizes, although it probably is fine for your projection needs. The best option, as suggested by others, is to do a dry run with both your largest and smallest files to see the actual results. If that's not possible, I personally would opt for projecting the larger images off a harddrive because I'd be very disappointed seeing too much pixelation in my images. But either way, your story sounds so compelling that most likely no one watching will have noticed any small image flaws.</p>

<p>Good luck!</p>

<p> </p>

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