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#1
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Poor quality images on projector despite high quality scan
Hi,
I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Any help would be welcome. Regards, Nikolaj Winther |
#2
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Nikolaj Winther wrote:
Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Any help would be welcome. Regards, Nikolaj Winther You should verify what are the maximum resolution, the number of colors and the frequency supported by the projector. Just to make sure that the signal goes through, change your display settings to 640x480, 256 colors and the lowest frequency for the graphic card. Once you get that working, you can increase the quality. |
#3
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Nikolaj Winther wrote:
Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Any help would be welcome. Regards, Nikolaj Winther You should verify what are the maximum resolution, the number of colors and the frequency supported by the projector. Just to make sure that the signal goes through, change your display settings to 640x480, 256 colors and the lowest frequency for the graphic card. Once you get that working, you can increase the quality. |
#4
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"Nikolaj Winther" wrote in message
om... Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Your high quality scans most likely contain a pixel count well above what your projector can deliver, thus your images are being quickly and roughly downsampled to fit your projector's needs. Figure out what your projector's specs are, and rework your images to fit the requirements. Save your original big scans, though. Those are great for printing! -- Regards, Matt Clara www.mattclara.com |
#5
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"Nikolaj Winther" wrote in message
om... Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Your high quality scans most likely contain a pixel count well above what your projector can deliver, thus your images are being quickly and roughly downsampled to fit your projector's needs. Figure out what your projector's specs are, and rework your images to fit the requirements. Save your original big scans, though. Those are great for printing! -- Regards, Matt Clara www.mattclara.com |
#6
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Nikolaj Winther wrote:
Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! You don't say "what" is bad about them, but I'll take the following whack at it: Projectors do not have very high resolution. In photoshop you must re-size your images to the projection resolution. At that size, use USM to achieve clean and haloless edges. If you embed the images in a Powerpoint or such, then again, the image must be sized correctly and USM'd for its size when projected. You may be having color problems as well, so edit the images using the projector nearby (this is the quick and dirty way). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#7
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Nikolaj Winther wrote:
Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! You don't say "what" is bad about them, but I'll take the following whack at it: Projectors do not have very high resolution. In photoshop you must re-size your images to the projection resolution. At that size, use USM to achieve clean and haloless edges. If you embed the images in a Powerpoint or such, then again, the image must be sized correctly and USM'd for its size when projected. You may be having color problems as well, so edit the images using the projector nearby (this is the quick and dirty way). Cheers, Alan -- -- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm -- r.p.d.slr-systems: http://www.aliasimages.com/rpdslrsysur.htm -- [SI] gallery & rulz: http://www.pbase.com/shootin -- e-meil: there's no such thing as a FreeLunch. |
#8
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"Nikolaj Winther" wrote in message
om... Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. Direct your queries to comp.sys.laptops - people there have a lot of experience in projecting presentations. I can tell you that this problem with terrible looking photos seems to happen absolutely loads - everyone seems to fall foul of it. However, it's not necessarily to do with your large file size - usually it's a problem more fundamental due to screen resolutions and projection resolutions not matching. MS Powerpoint will do an o.k. job of re-sampling the image to fit the screen, but this isn't all that's required. As I said, redirect your question - it happens so often, someone will have a clear answer there. Duncan. |
#9
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...and on the second point, if your computer is a laptop, look for a
little picture of a monitor - often it's on the F4 key. Holding down the laptops `Fn` key, and tapping F4 (or whichever) will then redirect the display signal to the data projector. Check the laptop's manual. If that doesn't help, check your display card's resolution and make sure it is in range (both resolution and color depth) for the projector. If all this sounds like gibberish, you really need to go find someone who has done this stuff before, and take copious notes..! |
#10
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On Thu, 17 Feb 2005 05:08:24 -0800, Nikolaj Winther wrote:
Hi, I'm due to give a lecture on my experiences in Australia, and I need to show some pictures I've taken in that regard. I've also downloaded pictures of exotic, yet common animals in Australia, that I don't have any pictures of myself. Now, I figured that by scanning the negatives in a fairly high resolution, I'd get the best results. I have a Canon semi-pro scanner that works fine (usually). Now I scan these negatives, and on my computer-monitor they look exellent - much better that the ones I've downloaded. I figured I'd burn them on a CD and show them using a DVD-player and a Big-screen projector. This seemingly works fine, except that the images that I scanned myself look horrible - whereas the infirior downloaded images look fine! Is there any reasonable explanation on why this is - and what I can do to fix it. And on a related matter - I thought about using the computer as a player, and just connecting it to the projector, that has a cable like the computer-monitor - but I get a NO SIGNAL. There's a switch on the projector that says "tv"/"Computer" and I have it on "Computer". Do I need a driver og is there some special something I have to activate on my computer? Any help would be welcome. Regards, Nikolaj Winther As the others have mentioned, this is a common problem with digital projection. Anything above the resolution of the projector is going to look crap because the VGA card of your laptop is sending a massive image to a device that can probably only project at either 640x480 or 800x600 pixels at a time. Change your scanned images to 72dpi and size them to the same dimensions as your projector. -- ? |
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