What is the difference between CMYK, RGB, and PMS?

 CMYK, RGB, and PMS are essential color models in design and packaging. This simple guide and infographic will help you understand the differences between these three color systems. Additionally, we’ve included a step-by-step process to perfect your design using Adobe Illustrator.

When designing printing material or packaging dielines, terms like RGB, CMYK, and PMS often come up, and they can be confusing if you're not familiar with them. Understanding these color systems is essential for creating accurate and professional packaging designs. In this post, we'll break down the different color spaces, explain when to use each, and show you how they can help streamline your packaging design process.

To summarize, here’s a quick guide: RGB, CMYK, and Pantone are used when you need precise and consistent colors across various printing processes.

By using the right system for the right application, you can ensure that your packaging looks as good in print as it does on screen. For a more in-depth explanation, feel free to check out the infographic below or read our detailed help article.

Before jumping into defining RGB, CMYK, and PMS, we first need to understand the differences between process colors and spot colors.

Process Color vs. Spot Color

Process Colors are created by mixing inks during the printing process. Four primary inks are blended to produce the desired shade, following the CMYK color model (Cyan, Magenta, Yellow, and Black). This method is also referred to as four-color printing and is often used for full-color images or designs that require a wide spectrum of colors. It is cost-effective because only four colors are used, but may not be as precise as spot colors in certain applications.

Spot colors, on the other hand, are pre-mixed inks that are used for specific, exact colors. These colors require their own printing plates and presses, making them more expensive than process colors. Spot colors offer greater accuracy in shade reproduction and are capable of producing a wider range of colors, including metallics and fluorescents, which process colors cannot achieve. Pantone is the most well-known system for spot colors, providing a standardized way to identify and reproduce specific shades. Spot colors are ideal when the precise color match is crucial.

What is RGB?

Source: Wikipedia Commons

RGB stands for Red, Green, and Blue, which is an additive color system. In this system, colors are created by adding varying amounts of red, green, and blue light. As the intensity of each color increases, the resulting shade becomes brighter. The vibrancy of colors in the RGB system ranges from 0 to 225. When red, green, and blue are mixed at their highest intensities, the result is white.

For instance, the green CustPrints logo you see on your screen is made up of 81 red, 220 green, and 133 blue. The mixing of these colors happens through light beams projected onto a screen, making RGB ideal for digital displays like TVs, phones, and laptops. It is a device-dependent color system, meaning it is specifically designed for screens that emit light.

However, RGB is not suitable for packaging because packaging relies on physical materials and inks, which do not emit light. For packaging, color systems like CMYK (Cyan, Magenta, Yellow, and Key/Black) or Pantone are used, as these are more accurate in reproducing colors on paper or other physical mediums.

What is CMYK?

Source: Wikipedia Commons

CMYK stands for Cyan, Magenta, Yellow, and Key (Black), and it is a subtractive color system. Unlike RGB, which starts with black (off) and adds light to create color, CMYK starts with white and uses inks to subtract light, thus producing color. The more colors you mix, the less light is reflected, and the darker the resulting color becomes.

In this system, you mix the four primary colors (cyan, magenta, yellow, and key) in specific ratios to achieve the desired color. When cyan, magenta, and yellow are combined, they theoretically produce pure black, which is why black ink (Key) is added as a separate component to achieve richer, deeper blacks.

For example, to replicate the green in the CustPrints logo using CMYK, the mix would be approximately 55% cyan, 34% yellow, and 14% black. This allows for accurate color reproduction on printed materials, like packaging, since CMYK is designed for physical media where color is created by combining inks.

What is PMS?

Source: Pantone

PMS stands for Pantone Matching System, or simply Pantone, which consists of premixed colors that offer higher consistency and accuracy in printing. Using Pantone colors ensures that your design or brand materials match each other perfectly, no matter where or how they are printed. Think about iconic shades like Tiffany blue or Coca-Cola red—these brands rely on PMS to maintain a consistent appearance across all their products and materials. For example, to ensure that the CustPrints logo is printed in the exact same shade of green every time, we would use Pantone 2268.

Each Pantone color has a unique code with a ‘C’ (coated) or ‘U’ (uncoated) suffix, which indicates the type of paper used for printing. Coated paper is smooth and shiny, providing sharp, vibrant prints. It is commonly used for premium packaging, such as custom rigid boxes or custom folding cartons.

On the other hand, uncoated paper has a rougher texture and absorbs more ink, resulting in a more muted finish. It’s ideal for rustic looks, such as kraft mailer boxes. For example, when printing on kraft paper, you would use a Pantone U color, while for other types of paper, a Pantone C would typically be used.

When to Use CMYK vs. Pantone

CMYK is ideal in the following situations:

• Home Printing Projects: If you're working on a project at home and want to ensure the color you see on your screen is accurately reproduced when printed, CMYK is your best option. It allows for a closer match between digital and printed colors.
• Budget-Friendly Printing: If you're concerned about costs, especially when printing multiple colors, CMYK is a more affordable choice. This color system only requires four basic inks, making it more cost-effective for larger print runs, like custom packaging.

However, keep in mind that CMYK hues can slightly vary between different printers or print runs due to their subtractive nature. This means the exact shade you want might not always appear consistently across different devices or batches.

Pantone is recommended in the following situations:

• Branding Materials and Logos: For logos and other branding materials, Pantone is the best choice. It ensures color consistency across different print runs, no matter where they are produced. This is particularly important for businesses that require their colors to remain the same every time, like iconic brand colors (e.g., Coca-Cola red or Tiffany blue).
• Special Colors: Pantone allows for the use of unique shades that CMYK cannot produce, such as neon colors or metallics, providing a broader color range and more precision.

However, it's important to note that Pantone tends to be more expensive than CMYK because it involves the use of pre-mixed inks, which adds to the cost of production.

How to make use of CMYK in packaging design:

The CMYK color system is essential for packaging design, particularly when aiming for cost-effective and precise printing. Since CMYK allows for the mixing of four primary inks to produce a wide range of colors, it is ideal for printing packaging materials, especially for projects that involve multiple colors or require accurate color reproduction.

To select CMYK mode in Adobe Illustrator:

1. Open Adobe Illustrator.
2. In the menu, click on 'File'.
3. Select 'Document Color Mode'.
4. Choose 'CMYK Color'.

This ensures that the colors you use for your packaging design are set up for the printing process, allowing for accurate results when your designs are printed. By using CMYK, you can get a more consistent and predictable color output, which is crucial when producing physical packaging.

Here's how to select CMYK mode in Adobe Photoshop:

1. Open Adobe Photoshop.
2. In the menu, click on 'Image'.
3. Click on 'Mode'.
4. Select 'CMYK'.

If you have a design in RGB format, you can convert it to CMYK, but be aware that colors may shift during the conversion. You might need to make manual adjustments to ensure the colors match your desired outcome.

Here's how to convert RGB to CMYK in Adobe Photoshop:

1. Open Adobe Photoshop.
2. In the menu, click on 'Edit'.
3. Click on 'Convert to Profile'.
4. In the dropdown menu next to 'Destination Space', select 'CMYK'.

Once you’ve converted your design to CMYK, you can adjust the colors to ensure they look as expected for print.

Now that you have a better understanding of the different color systems and how to use them, it's time to start designing packaging that will impress your customers!