Well done with the 4 colors!

well not completely transparent, just, well actually i take that back. i like it how it is.

 Nice :)

no :s i seen that to later :(

The nerd in me can't help point that rainbows have no perspective IRL

Nice one anyway. I wonder if the blue interval between yellow and red was necessary. Did you try dithering the yellow into the red?

I like the perspective on the rainbow and I think the colours work nicely :)

yeah, you're right, but i think that we couldn't see the red ? ^^'

I would have used a more subdued red to make the rainbow look more transparent. otherwaise very good. (and fast!)