It's because using telescopes on such a vast distances corrupts the colour. Remember, that the colours we can see, and appreciate are bound in to a narrow band of frequencies, and taking pictures on a single frequency make better pictures. Of course, you could do 3 distinct images, in the red, green, blue frequency bands, but by that time you make three photos, Cassini changes its position considerably, hence the photos will not cover the same angle. It's fairly big thing to get a single frequency band phot
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/xG8kd-vI25w/story01.htm
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