Weird thing about Lockbits and thumbnails

[hugohugo37]

So I load in a jpeg and then I manipulate it using the lockbits method and I save it and everything is great. Lets say for example, I load in a picture of a cat and then, using lockbits, I put a big blue dot right in the middle. The weird part is that the change is not reflected in any thumbnail image of the picture. Say I save it to my my pictures folder. The thumbnail shows the original picture of the cat but when I view the actual picture, it has the big blue dot in the middle. Anyone have any idea what's going on here?

Thanks

 

[JohnH]

Are you asking how often Windows Explorer is updating its thumbnail database?
If you deleted the Thumbs.db local folder file it would force Explorer to create a new one next time user viewed that folder with Thumbnails View.

 

[hugohugo37]

Yeah basically I can just right click on the picture and "refresh thumbnail" that seems to do the trick. Thanks, you led me in the right direction.