original image thumbnail

kind of a weird question...

when i do the thumbnail view of an image in the finder, the thumbnail of this specific image seems to be of the original image, which has since been edited. when i open the image, it shows up as a cropped version of the thumbail. is there a way to open the thumbnail (original) version, bigger than the thumbnail (original size)?

Do a command+i on the image. Then select the thumbnail in the top part of the get info window. Hit delete. Finder will then generate a new thumbnail for the image.

This will delete the thumbnail so if in case you somehow want to save your thumbnail, I'm not sure how to do that. Although, you could just view that folder in Coverflow mode, which will stretch the thumbnail upto 512*512 pixels and grab it off the screen.