Quick Look Photos Blurry

Quick Look incorrectly renders thumbnails (previews) of some photos as blurry. They are high resolution, normally rendered photos when opened but their thumbnails are blurry.
Other photos within the folder show normal, crisp thumbnails (previews).
I do understand that the quick look, or cover view, rendering of folder contents utilizes an algorithm in which photos briefly are blurry. However when the cover flow comes to a stop on the photo in question it should become crisp and sharply focused. For a few photos in my folder this does not happen.
I do not know how to force quick look to re-render these photos correctly.
Assistance.

Asked and answered not here in apple support but MacLife @ http://www.maclife.com/article/jaggyadobe_jpegs_in_leopards_coverflow
Discussion noted: "The fix. According to Apple, if a file already has a preview, "Leopard respects the preview." If there's no preview, "Cover Flow will provide a large size preview." The fix involves removing the preview from Adobe JPEG files.
In Photoshop CS3, go to Preferences (Photoshop > Preferences > File Handling). Under the Image Preview pulldown menu, select Never Save. Then open the Adobe JPEG file and save it as a JPEG. The file will save without a preview, and Cover Flow will create a crisp and clean one."

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