The text itself is tricky:
http://creativecommons.org/licenses/by-nc-nd/2.5/
"# No Derivative Works. You may not alter, transform, or build upon this
work."
http://creativecommons.org/licenses/by-nc-nd/2.5/legalcode
b. "Derivative Work" means a work based upon the Work or upon the Work
and other pre-existing works, such as a translation, musical
arrangement, dramatization, fictionalization, motion picture version,
sound recording, art reproduction, abridgment, condensation, or any
other form in which the Work may be recast, transformed, or adapted,
except that a work that constitutes a Collective Work will not be
considered a Derivative Work for the purpose of this License. For the
avoidance of doubt, where the Work is a musical composition or sound
recording, the synchronization of the Work in timed-relation with a
moving image ("synching") will be considered a Derivative Work for the
purpose of this License.
I would be exceedingly surprised if any court were to hold resized
images to be a derivative work, rather than a verbatim copy. The
license allows you to reproduce a digital image in, say, a book, and
doesn't specify any particular size at which you must reproduce it.
It's more akin to printing a CC-ND text in a different font (permitted)
than to summarizing it (not permitted).
-Mark