Resolution Problem?

I shot a photo of my car to use on a web forum. I’m using my Canon G6 and Adobe photo Elements 2. I use two computers, desktop and a notebook. When I resize my image for the web it looks good on one computer (desktop) but awful on the other.
When I preview the image in Internet Explorer or post the image in the forum it looks good on my desktop computer but the same image looks very poor on my notebook. By poor I mean squiggly straight lines. At first I thought the file size was reduced too much but after experimenting I don’t think thats it. Why does this happen?
All the other images on the forum are sharp regardless of their size when viewed on either my notebook or my desktop. I wonder if other people see a good image or an awful image?

Link to Photo

Important Info
Camera settings:
Image Resolution: large 3072 x 2304
Image Compression set to superfine
Original image size: 1102 x 654 KB "after cropping"
Final image size: 816 x 459 KB
Smaller final image: 480 x 279 KB
Default desktop screen resolution: 1024 x 768
Default notebook screen resolution: 1680 x 1050


I have tried smaller and larger images but get the same result. I use a web hosting site for my pics.
Sorry for the long post.

It looks to me like there is a problem with aliasing. That's where you get jagged lines instead of smooth ones. It's almost certainly an artefact of the resizing process you used. Most software applications can use a variety of methods for resizing (a.k.a. downsampling) photos. You might have used a "quick-but-crude" method (e.g. linear interpolation) instead of a "good-but-slow" method (e.g. bicubic interpolation). Check the manual or Help section for your software.

I used bicubic. I'm using Adobe Photo Elements II on a computer with an ATI Radeon graphics card with anti-aliasing enabled. Now I'm told that other prople say that my image looks great on photobucket.?

For some strange reason my images only seem to look really bad on my computers.

And mine. I've looked at that image on 3 different monitors attached to 2 different PCs, and it suffers from aliasing every time.

Please tell me what I should do to correct this situation.

Jags are more pronounce in the horizontal lines then the vertical. It looks more like a compression issue. The problem might be from over saving in JPEG. Since the camera I assume is outputing the pics as JPEG and after you work on the pics in PSE you save it then downres the pics further for web might cause it to pixelated more. Usually when you downres a pic you are dumping pixel and when saving you are dumping more pixels and seems to be the problem w/ your pics.

Another factor is that P&S cameras use very small sensors and because the photosite are small the noise inc and when downres the pic you are loosing more pixels. So on & so on.

I shot this image with a Canon G6, 7.1 megapixel camera. I had the resolution set to 2048 x 1536. Did I try to reduce it too much?

What is the highest image resolution that I can use that can be reduced to 800 x 600 without any pixelation or bad effects?

In actuality cameras in general have only one resolution and it is the native resolution as for yours it would be 7.1MP so the lowest res you should shoot w/ is 7.1MP. Shooting at a lower res would only mean are throwing away resoluion w/ compression. If posible sshoot in RAW, I believe the G6 is capable of shooting in RAW. then during your convertion you can control the size of the pic.