How to crop a large jpeg into smaller tile jpegs?

For example, I have a big.jpg which is 600 (w) x 300 (h), I would like to crop it into 250 x 250 each. Such that big.jpg becomes 6 tile jpegs:

tile_0_0.jpg (250 x 250)
tile_0_1.jpg (250 x 250)
tile_0_2.jpg (100 x 250)
tile_1_0.jpg (250 x 50)
tile_1_1.jpg (250 x 50)
tile_1_2.jpg (100 x 50)

A开发者_如何学Cny tool (command line or GUI) to recommended? Thanks!

---

http://www.imagemagick.org/Usage/crop/#crop_tile

---

My favorite tool to do that kind of thing is GD.

---

for windows, I typically use windows image resizer powertoys clone: http://imageresizer.codeplex.com/

After you install it, just right click a group of images in explorer, click resize, choose your size and bam. It does the rest :)