I have designed a baby shower invitation in Photoshop Elements 8. The card looks great on my screen. I resized it to fit the dimensions of Vistaprints 6x9 invitations, still the color looked bright and vibrant. I uploaded it to Vistaprint and it looks very dull and flat. The card is bright pink and neon green but in VP it's very pale. When I compare the PS one to the proof of the Vistaprint one the difference is drastic. What can I do to fix this?