Send your files with an sRGB color profile embedded. Though our printers use a CMYK based ink set, please DO NOT CONVERT TO CMYK. Our conversion algorithms are optimized to produce the best possible conversion from sRGB to CMYK to maximize the resulting color gamut.
We do not alter the color in your images in any way. We strive to print as accurately as possible. If you have a high quality, calibrated monitor, we're confident you'll be happy with the accuracy of the print.