Why does the artwork need to be in CMYK mode?
CMYK is short for Cyan-Magenta-Yellow-Black, and pronounced as separate letters. CMYK is a color model in which all colors are described as a mixture of these four process colors. CMYK is the standard color model used in offset printing for full-color documents. Because such printing uses inks of these four basic colors, it is often called four-color printing. When your artwork is in CMYK mode, it make easier for making the film that is required for the printing. If your artwork is in RGB mode, you will need to change it to CMYK mode. In most cases the changing from RGB to CMYK is complete un-noticeable. But some many cases the change can distort the contrast and brightness of the original picture. Make sure to make some final touch-up to get the desired color you need. Pay special attention to the BLUE color. Changing a blue from RGB to CMYK is almost always noticeable.
CMYK is short for Cyan-Magenta-Yellow-Black, and pronounced as separate letters. CMYK is a color model in which all colors are described as a mixture of these four process colors. CMYK is the standard color model used in offset printing for full-color documents. Because such printing uses inks of these four basic colors, it is often called four-color printing. When your artwork is in CMYK mode, it make easier for making the film that is required for the printing. If your artwork is in RGB mode, you will need to change it to CMYK mode. In most cases the changing from RGB to CMYK is complete un-noticeable. But some many cases the change can distort the contrast and brightness of the original picture as in the real world some colors are simply cannot be produced with the CMYK colors. Make sure to make some final touch-up to get the desired color you need. Pay special attention to the BLUE and ORANGE colors . Changing a blue or orange from RGB to CMYK is almost always noticeable.