All print files should be submitted in CMYK colors as this is what is required for our print process. If you submit your artwork in RGB colors, they will automatically convert to CMYK which may shift the color.
RGB has a much larger range of colors than CMYK. RGB is used on your computer monitor, TV, and other screens. CMYK is used by ink in printers and have a smaller color range.
Please note the colors on your screen may not match what is on print due to monitor color calibration and other variations.