I'm not sure if this is the right thread, if it isn't then please let me know.

I switched from Windows to Mac a year ago, and this problem has been bugging me since then but i've never got round to sorting it out. When I print images/graphics from my mac using my Epson printer the print is always very purple and dark no matter the colour. I'm not sure why this happens and i'm not sure how to go about correcting it, as this printer's quite expensive and high quality and prints perfectly from my sister's Windows computer. Is this a problem with my Mac, do I need to do anything specific to change it?

Thanks for your time