Photo quality worse when viewed on a PC -- why?

I'm experiencing a strange issue with some photos that I've touched up in iPhoto. When viewing the photos in iPhoto, they look fine. When exported into a different folder and viewed in Preview, they look fine. But later on I tried opening up the same exported files (jpeg's) on a PC, and some of them looked horrible. Some were horrendously noisy. Some had colors that seemed off. Some were far too sharp (I was playing around with the sharpness adjuster in iPhoto).
Has anyone experienced this issue before, and does anyone know why this happened? I plan on simply going back and toning down some of my edits/adjustments, but I'd like to know if there's an explanation for this.
One odd thing I noticed just now is that when opening some of these "bad" jpegs in Preview, for a split second, the photos look like they did on my PC. For example, I could see the pixel noise in one of them for a split second... similar to the way iPhoto first displays a blurry enlargement when double clicking on a photo. It almost seems like Preview and iPhoto are self-correcting bad images for display. Thoughts?

The primary cause of the misalignment is the fact the text is using a "Web Safe" font. A "web safe" font is not a single font. Rather it's a list/stack of fonts for the site visitor's browser to try until it finds one that's available the visitor's computer. That means on one computer the text is in one font (i.e. Arial) and on another computer it's another (i.e. Helvetica) with the subsequent fallout caused by the varying character widths between the two fonts. The best way to reduce this variation between site viewers is to use a Web Font (either an Edge Web Font or a Self-Hosted Web Font).
The alignment still won't be entirely consistent across browsers (or even versions of browsers), because each browser has it's own text layout engine and the engines do sometime change, but the variation will be radically reduced.

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Are you using high resolution images? If so, try lowering the resolution. Or try an app that specializes in iDvd slideshows.
http://www.lqgraphics.com/software/phototomovie.php
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I've have this problem in the past on both aTVs, but the pictures where taken with a Canon and uploaded to mobileme from an iMac. I figured it was a minor inconvenience and that Apple would resolve this in subsequent updates - this was over a year ago.
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Updating the information regarding photo orientation with AppleTV screen saver.
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Thanks for helping, I really appreciate it.
No it just lowers in quality. It plays fine though no stuttering.
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http://sleeptolive.com/
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Ps
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When Viewing Adobe Connect Training, why are Audio/Video out of synch

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Dang, though it was worth a shot.
Now, one user here, Jim Simon, uses similar, and has worked out a percentage that he adjusts the remote mic's material to fit with his camera. Cannot recall exactly now, but it seems that he alters the Audio by a factor of about 104%. My memory is cloudy on the exact figure, and Jim seems to be on extended holiday. Not sure now, if he uses the Rate Stretch, or runs his mic's audio through Audition. Sorry that the memory is so fuzzy now.
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Slight Color and Quality Shift when viewing RAW files for first time in Library Module.

Hello,
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2. Can I prevent LR from applying the Adobe Standard Style and apply no style?
3. Can I cause LR to apply the Style as set in the camera for the particular image to be appied automatically upon import?
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Scott

That sort of describes it and may be exactly what is happening. I have a shoot tonight and will pay closer attention to the process and behavior when I import.
It is the full image that I see the shift on though. Its not that the thumbnail and the full size image look different. It the full size image looking one way and then shifting in front of my eyes.
What is frustrating is that I typically find that the image before the shift is better than what appears after the shift, so I find myself always chasing to get back to where it was and because its gone I'm chasing an invisible ideal, so to speak.   Ahhh...isnt that the life of a photographer though!
It seems like its the last step in the render process -- if I could just figure out what it is and stop it I could finally figure out if I really care or not. Its just so quick its tough to tell if indeed the first appearance is better.
I'll feedback some more information when I get a better handle on this.
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They lose a lot of resolution...
they have to ...
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Hello,
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Thanks for responding Lori - yeah, for whatever reason the image quality isn't quite as crisp when we use the PDF Printer. If that's the way the system is designed then I guess we'll have to do it that way and sacrifice some image quality, printing notes is more important, would be nice if we could print speaker notes via PDFMaker though.

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Hello,
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What version of Photoshop?
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Arrow keys do not work, either. I tried that.
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so an update to this situation:
I took it back to the apple store and they exchanged it out for me, but after syncing my photos again its doing the exact same thing.
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That is called pressing F1 to bring up the help file... or, to read outside the program
Online User Guide http://help.adobe.com/en_US/premiereelements/using/index.html
-Page to download current PDF http://helpx.adobe.com/premiere-elements.html
-Previous versions http://helpx.adobe.com/premiere-elements/archive.html
Amazon books
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-v09 http://www.amazon.com/Muvipix-com-Guide-Premiere-Elements-version/dp/1453871209/
And, some online reading
Importing Video http://forums.adobe.com/thread/1065281
-and project settings http://forums.adobe.com/thread/1112086
Saving & Sharing http://forums.adobe.com/thread/1051093
Sharing for Computer http://forums.adobe.com/thread/1058237
Steve's Basic Training Tutorials... steps are the same for several versions
-http://forums.adobe.com/thread/537685
FAQ http://forums.adobe.com/community/premiere_elements/premiere_elements_faq
TIPS http://forums.adobe.com/community/premiere_elements/premiere_elements_tips
Another help site http://muvipix.com/ or http://muvipix.com/phpBB3/

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Hi Tom, thanks for your swift response. I'm stuck with FCE 1.0 and no, i'm not using a monitor because the camera, used as link between computer and monitor, is at school. I'll try using the monitor tomorrow.

Photo quality worse when viewed on a PC -- why?

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