What color mode should my files be? What color mode should my files be? May 6, 2018 admin If you send us an RGB file, there is a chance that a color shift may occur and you may not be satisfied with your job. You should always start and finish your designs in CMYK color mode. Newer What printing process do you use for T-Shirts? View all posts Older What T-shirt material do you offer, and how does it fit?