[Image-SIG] crop question

[Ken Seehart]

Jason Van Anden wrote:
> I am trying to take an existing image and split it into equally sized
> tiles.  When I try to save a "cropped" image I get the following
> error:
>
> "tile cannot extend outside image"
>
> The first pass saves the first tile correctly, the second one chokes
> and blurts the error.
>
> Following is some code to illustrate my confusion:
>
> original_image = Image.open("big_image.tif")
>
> # math stuff
> w, h = orig.size
> self.tile_width = w = w/self.tiles_across
> self.tile_height = h = h/self.tiles_down
>
> for y in range (self.tiles_down):
>
>     for x in range (self.tiles_across):
>
>         box = (x * w, y * h, w, h)
>         tim = original_image.crop(box)
>         tim.save("test.tif")
>
> Advice super appreciated!
>
> Thank You ~ j
>   
Crop uses right and lower instead of width and height for the last two 
elements of the box.


      crop

*im.crop(box)* => image

Returns a rectangular region from the current image. The box is a 
4-tuple defining the left, upper, right, and lower pixel coordinate.


- Ken