CMYK and RGB colors render differently depending on which medium they are used for, whether it be on the web or in print. Let’s go further into detail on this question.
If printers are using a digital printing method, they would print color on paper using CMYK colors. This is a four color mode that utilizes the colors cyan, magenta, yellow and black in various amounts to create all of the necessary colors when printing images. It is a subtractive process, which means that each additional unique color means more light is removed, or absorbed, to create colors. When the first three colors are added together, the result is not pure black, but rather a very dark brown. The K color, or black, is used to completely remove light from the printed picture, which is why the eye perceives the color as black.
RGB is the color scheme that is associated with electronic displays, such as CRT, LCD monitors, digital cameras and scanners. It is an additive type of color mode that combines the primary colors, red, green and blue, in various degrees to create a variety of different colors. When all three of the colors are combined and displayed to their full extent, the result is a pure white. When all three colors are combined to the lowest degree, or value, the result is black. Software such as photo editing programs use the RGB color mode because it offers the widest range of colors
In short, if you’re going to be printing something, such as a business card, stationary, or a newsletter, use CMYK. CMYK does not include a white color because it is assumed that it will be printed on a white paper and depending on the percentage of each color that is used, the white from the paper will be used to fill the space, therefore making the shades appear lighter.
If it’s something that will only be seen digitally, use RGB. The Internet is set up to work exclusively with RGB colors and there is a simple explanation behind this. A digital monitor is made up of tiny units called pixels. These pixels are comprised of three light units, one for red, one for green, and one for blue. The RGB values are applied to these pixels, thereby setting the luminosity for each of the light units in each pixel.
It should be known that there is no perfect correlation between the two types of colors, but when converted, a very close match can be achieved.
These color render differently based on the amount of white space that is already provided and how much “mixing” of colors needs to occur. In order to get the correct color on all mediums, the colors need to be converted. Highland Marketing did a great job of explain why RGB colors need to be converted when you’re creating something for print: “The RGB scheme has a greater range of colors than CMYK and can produce colors that are more vivid and vibrant. These colors are beyond the range of CMYK to reproduce and will come out darker and more dull in print than what is seen on the monitor or display. Because the RGB color mode has the full range of colors, documents shown in CMYK mode will always show up precisely on-screen. RGB colors, however, will not necessarily appear in print as they do on-screen. To accurately print the document or image, it must be converted from its original RGB format to CMYK. It is possible to do this by using software such as Adobe Photoshop or Adobe Illustrator.” Consequently, the same art displayed on a computer monitor may not match to that printed in a publication.
Below is an example of a photo originally produced in RGB colors converted to CMYK colors as displayed on a computer monitor. Notice how the colors are much more vibrant on the RGB picture.
Below is an example of a Video originally produced in RGB colors converted to CMYK colors as displayed on a computer monitor. Notice how the colors are much more vibrant on the RGB picture.