Have you pressed one of these onto a shirt yet? The colors come out dull on the paper but when pressed onto the shirt they are rich and vibrant. Maybe that is the problem?? Or you may need to adjust the color setting in photoshop or your printer. I think in photoshop on color settings there is an option you can check for "same as source". Doing that will make the printer print colors that are the same as what the source color is from photoshop.