Membranophonist’s Ramblings

The Finder has a really irritating bug (Number 4250369) involving the automatically generated thumbnails of bitmap images. Simply put, they don’t automatically update when the image is altered.

1. For safety, make a copy of an image.
2. Place the image in a folder in Icon view, with the window set to display previews (this is toggled via the View menu -> View Options (Command-J) -> “Show icon preview” checkbox).
3. Notice that the thumbnail is of the image.
   
4. Open the image in Preview or GraphicConverter.
5. Select a portion of the image with the rectangular marquee.
6. Crop the image to the selected region (Command-K in Preview, Command-Y in GraphicConverter).
7. Save the modified image.
8. Return to the Finder window in which the file is displayed and notice that while the height and width dimension information has correctly updated, the thumbnail preview has not. Closing and reopening the window doesn’t correct the problem either; it seems to require restarting the Finder (via the Apple menu -> Force Quit dialog).
   
9. Shake your fist in the air while yelling, “Curse you, Finder team!”*

*Optional

Woody Shaw was a fantastic trumpet player and composer. His albums are somewhat obscure but worth the search.