Some colors may look a bit different on particular types of paper...Photo paper is most importantly pure white, while the ordinary copy paper we use in our home printers is rather a really really bright gray. Also, if you use glossy photo paper, you get the impression of more vivid colors and higher contrast, thus otherwise pallid colors might look a bit more intense.Also, some printers have a different color range than others.This depends on the type of ink, the number of ink cartridges and the technology used (lithography, thermosublimation,...).It would help a lot, however, if I knew which printer you use at home and- if possible- which printer they use at the lab where you send your pictures to.