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The wonderful article linked by Wayfaring Stranger in the comments alludes to the reason for not sending photographs, but does not answer the question directly. As with most spacecraft outside Earth or Lunar orbit, the data rate is extraordinarily low. This page gives data rates for the current Rosetta mission, which are on the order of a dozen or two KiB/s. ...


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Apparently they have been inferred to be "220 meters". See the references in: S. D. Kadel, S. A. Fagents, "TROUGH-BOUNDING RIDGE PAIRS ON EUROPA", , Lunar and Planetary Science XXIX. (PDF)


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