The codex doesn't indicate this so I'm wondering if anyone else knows:
There are two basic types of images: the original uploaded image, and the image(s) derived from it for things like thumbnails etc. The derived images are easily identified because they have the filename format
<original>-<width in pixels>x<height in pixels>.ext
When this function is called with the ID of an originally-uploaded image, will all derived images also be deleted? Or will then be left there as clutter?