Jpeg icons are jagged

I'm going through my images, archiving some, tossing others. I've come across a folder full of jpeg images where the icons are so jagged you can't see what the image is.
How do I tell Finder to go through all these images and update the icon so that it is not pixellated?

I try and get by with the minimum amount of software on my system, but thanks for the suggestion of GraphicConverter.
Are you saying that Finder cannot "reicon" icons? Most of the icons are okay, it's just these 100 or so in one folder that have gone haywire.
If I open the files in Photoshop and "Save As" the icons come good, but I am afraid that by doing so I would be re-compressing the images, causing a slight degradation. Also, if I "Get Info" and look at the preview, the preview looks okay and and the icon is larger than what is displayed for the 128 x 128 maximum icon size. So Finder does know how to display the icons properly, but it has forgotten how to in the case of the images in this one folder.
Is there no way to tell Finder to go through these images and "reicon"?
Another question: where are the preview icons stored? Inside the image?
Message was edited by: Guy Burns

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Jpeg preview icons are jagged in the Finder

I'm going through my images, archiving some, tossing others. I've come across a folder full of jpeg images where the icons are so jagged you can't see what the image is. Most of my other jpeg preview images are okay, and when I Get Info (from Finder) the preview shown for the sus images is also okay.
I've asked in the Apple forums whether I could ask the Finder to go through all these images and update the icon, but no joy so far.
When I open an image and Save As in Photoshop, the icon is okay – but being jpeg, I assume the image will be recompressed, and therefore the quality (already borderline from my 10-year-old 2 MP camera) will be degraded further. Also, I don't want to convert to Tiff as I want to save space by archiving the original jpeg just as it came out of the camera.
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hi
I have faced the same problem ... I didn't find the solution yet
but please visit this link http://www.oracle.com/technology/products/forms/pdf/webicons.pdf
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