ebb was the old tool and looks like it is on its way out, a very least
from Debian and for pdfTeX.
From manpage:
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Here are more details about the bb and xbb formats:
The original ebb (from dvipdfm) ignored density information in bitmap
images, and generated bounding boxes with 100px = 72bp = 1in. Unfortu‐
nately, screenshots (especially) tend to look bad with this approach.
So, extractbb (from dvipdfmx) uses density information if present.
Otherwise, it generates bounding box with 100px = 100bp. This is what
pdfTeX does.
7dbe8e0ec4