The following link has a wealth of information about observing planets with filters.
http://alpo-astronomy.org/
For some reason I cannot copy the address of sub-links from the above web site. The information on filters can be found by doing the following:
Click on the above link.
Click on Mars Section in menu at left.
Click on Mars Software and Articles in menu at right.
Click on Observing the Planets with Color Filters.
Scroll down under the heading Effects of Filters on the Moon and Planets.