Help with Vector thingy

[MauFonseca]

Hello.
I Made this Vector-ish image based on the "Dark Side of the Moon" cover, But the rainbow turned out very pixely...
I want to smooth it out a little bit, but without loosing the vector look...
Any recomendations?

Here is the image:

(Click for Full View)

[ronmatt]

insted of making something 'vectorish', why not use a vector program. keep in mind too, that if you save as almost any file format ( .tif, .jpg, .png ) the image will raster anyway. that leaves the vector formats ( .ai, .eps ) the next option would be to up the ppi ( 600 + ) the more pixels per inch, the smoother it will get. be sure you antialias as well