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What Is the Difference Between CMYK and RGB Colors?

Mar 06,2025 | JINGYU OPTOELEC

Understanding the difference between CMYK and RGB color models is essential for designers, photographers, and anyone working with digital or print media. These two systems serve distinct purposes, and using the wrong one can lead to unexpected results. Here’s a breakdown of their key differences:  

Core Purpose  

RGB (Red, Green, Blue) is an additive color model used for digital screens (monitors, TVs, cameras). It creates colors by combining red, green, and blue light at varying intensities. When all three are at maximum (255 each in 8-bit systems), they produce white light.  

CMYK (Cyan, Magenta, Yellow, Black) is a subtractive model for print media. It mixes pigments to absorb light, with black (K) added to improve depth and compensate for impurities in CMY inks. Combining all three base inks theoretically produces black, but real-world limitations require a dedicated black ink.  

Color Range and Limitations

RGB offers a wider gamut, capable of displaying over 16 million vibrant colors, making it ideal for bright, illuminated screens.  

CMYK has a narrower range due to ink constraints and paper quality. Colors may appear duller in print compared to digital designs.  

Technical Challenges in Conversion

Converting RGB to CMYK (or vice versa) isn’t straightforward. RGB’s bright greens and blues often lose saturation in print, requiring manual adjustments. Printers also limit total ink coverage (typically under 300%) to prevent issues like smudging.  

When to Use Each Model 

RGB: Digital content (websites, apps, social media).  

CMYK: Physical products (brochures, posters, packaging).  

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