why if i cover up parts of a photo with a censor black bar windows explorer thumb nailer ignores it?

Question

I edit an image that had "bits not to be seen". saved it over the original. windows thumbnail still shows the unedited version of the picture. even if it is send via email to another computer. Why is that so? If i put black boxes over something in the picture is that data original data still in the picture? 2 reasons. one don't want people seeing the original picture. also i saved over the original and do not have a copy how can i remove what i edited on that picture? played with gimp imagemagick on linux and still nothing. xp just shows the picture as if it was never edited. Vista shows it the same for a sec or 2 then shows the edits. it is a flat jpeg image. would be happy to supply part detail of a imagemagick 'identify -verbose foo.jpg' if it will help figure it out. GNU systems show the thumbnail just fine with totem's thumbnailer.

Answer 1

The problem might be with cached thumbnails.
Fix in XP:
1. In Explorer, go to Tools -> Folder Options or open the Folder Options icon in the Control Panel.
2. Choose the View tab, and turn on the Do not cache thumbnails option.
3. Click Ok.

Can't do that in Vista. You will have to use Vista's Disk Cleanup and check mark Thumbnails to delete them.