Can you make a screenshot of the issue in action? I looked at my own jpegs, it is normal as far as image quality goes... I don't see any image degradation in anyway... If I use Picasa's Preview, when I zoomed in - it will apply a light gaussian blur to the image, making it to look a bit smoother...
zzz2496
Its NOT a display or graphics issue.
When using the email photos button at top or side of the windows folder, this creates an email (in outlook or default program) with the photos already attached.
Its these photos from Windows 7 have more compression, distortion, and are overall less smooth. See my comparison attached.
Click the image I attached to see. To me it is quite plain & easy to see. There IS a difference. I created this by using the same method, one using XP, one using 7.
I do see very small difference, yes it's compression artifact... But why can't I reproduce your issue with my paint? I created a screenshot of my desktop for this thread, I don't see any artifacts in my picture... can you? It's made with MS Paint, installed with Windows 7 Ultimate x64...
zzz2496
I should clarify (not sure if I already have), that this zooming problem is when zooming to the point that the image has to be upscaled (i.e. to the point where it goes past the intended resolution). This zooming problem does not occur until the image reaches this point. Therefore, the problem exists in the way Win 7 upscales (or whatever you want to call it) an image as compared to XP. Zooming in on a high resolution image within its intended range of display resolution yields no problems. So, Arc is sort of right in saying this stems from the image itself just not being high enough resolution to zoom in as far as I am, but also shows this problem of how XP displays a blurrier image in a smoother format than the blocky/pixelated way Windows 7 does.
Does that make more sense?
Looking at the images, I would guess that the compression ratio is the same. The amount of artifacting looks exactly the same BUT it appears that the Windows 7 one has been "Sharpened". Look specifically at the bricks.
If you load the XP one into photoshop and sharpen it it will look like the 7 one.
There is definately a difference, but exactly whats causing it... dunno.
I am loosing this thread I think. We started off with Windows 7 email photos being of lesser quality the XP. There does appear to be a very small difference and one can't help thinking "Does it really matter that much?" If you have an important image to send you would send it surely as an attachment at as higher quality as the recipient was able to receive!
We now seem to have gone into the hazy area of zooming. OK there seems to be a difference between XP and Win 7 but I for one can only see the difference when the two are put side by side! Not that many people have a dual boot system so again I ask "Does it really matter that much?"
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but why ... it is to think ....