You designed a stunning brochure with vibrant neon blues and electric greens. You sent the PDF to the print_shop. When the boxes arrive, the colors look muddy, dull, and lifeless. What happened? You fell victim to the RGB vs CMYK divide.

The Core Difference

• RGB (Red, Green, Blue): Used by screens. Colors are created by adding light. 100% of all three makes White. It has a massive 'Gamut' (range of colors).
• CMYK (Cyan, Magenta, Yellow, Key/Black): Used by printers. Colors are created by adding ink. 100% of all three makes muddy black. Its gamut is small. It physically cannot reproduce neon light colors.

The PDF Proofing Step

When you export a PDF for Web, use RGB. When you export for Print, you MUST convert to CMYK. If you don't, the printer's machine will do an automated conversion, which usually just chops off the brightest colors, making them look grey. By converting the color profile using a PDF Tool, you can see on your screen (Soft Proof) what the ink will look like, allowing you to adjust the saturation before it's too late.