For some reason, JPL/NASA sure has gotten skimpy on their file resolutions.
Here is what happened when Cassini took a picture. They would take four of them in infrared. The first picture which would be high resolution black and white. Then there would be three more pictures with specialized red, green and blue filters. Then color the red picture red, the green picture green, the blue picture blue and overlay the colorized pictures over the high resolution black and white.
Below are two examples of the high resolution black and white:
Here are the pictures with color added:
Below is a link to where I downloaded these pictures from: