HELP! Blurry OS X thumbnails. How to fix??

[macenforcer]

I have tons of photos on my mac. Some of them have blurred images when in thumbnail view and the upper right hand corner of the thumbnail has a bent edge on it. If I open get info there is a little thumbnail in the upper left hand corner of the get info box. If I click on that image and press delete and close the get info box the thumbnail is now fixed.

Why do I have to do this to some images?

I have been looking around for some info on this but have come up empty. How do I fix all my thousands of images without opening each one with get info and deleting the icon? Does it have to do with exif data? How do I fix this?

I am in desperation over this.

 

[motulist]

The thumbnail was generated by whatever program you saved those photos through. Only once you delete those does OS X generate its own thumbnails. Download graphicconverter and run a batch to remove them all. And change the thumbnail prefs in the image app that you've been using that caused the problem in the first place.

 

[macenforcer]

Graphic converter didn't help but I downloaded CocoThumbX and it fixed them all. Now to remove the white frame that os x shows around all the thumbnails it generates. How can that be done?