How to save a high quality .gif file from SolidWorks
Don't confuse the program of solid modeling and animation software!..
GIF and quality?... maybe it's a fantasic world, but you can read about limitations there -> http://www.w3.org/Graphics/GIF/spec-gif89a.txt
And there is no way to save *.gif from SW.
You can save video and convert to *.gif or do a lot of renderings and combining them.