Unlike process colours (CMYK), which rely on mixing four inks to create a range of colours, spot colours are pre-mixed inks applied individually during printing.
Using spot colour ensures precise colour matching, consistent results across print runs, and the ability to reproduce colours that CMYK cannot achieve, such as metallics, fluorescents, white and particularly hard-to-reproduce brand colours. To get the best results, it is critical to set up spot colours correctly in your artwork.
Choosing the right spot colour system is another important step. The Pantone® Matching System (PMS) is widely used in commercial printing because it guarantees consistent colour reproduction. In Europe, RAL or HKS colour systems are often used for corporate branding and signage.
When working in your design software, whether Adobe Illustrator, InDesign, or Photoshop, ensure that any required spot colours are converted to CMYK wherever possible. Doing so can provide significant cost and time efficiencies, as process colours are generally less expensive than using multiple spot inks and can simplify printing workflows. Additionally, some printing machines are limited in the number of spot colours they can handle, making CMYK conversions more practical for certain jobs.
However, keep in mind that converting a spot colour to CMYK can cause noticeable colour shifts and reduce colour accuracy. If this occurs, the colour should remain as a spot colour. For example, gold does not convert well to CMYK, often appearing brown instead.
Spot colours should be applied primarily to solid areas, text, logos, and other vector elements. Applying them to gradients or raster images can complicate the separation process and may produce unpredictable results. It is also important to name each spot colour clearly, for example “PMS 485 Red,” to avoid confusion during prepress.
Before sending your artwork to us, it is essential to check colour separations. Use your design software to preview separations and ensure that each spot colour is assigned to its own plate. Verify that no unintended tints of process colours overlap your spot colour areas, as this could compromise the final printed result.
Finally, consider the cost and quality implications of your spot colour usage. Minimise the number of spot colours to control expenses, avoid tinting spot colours beyond 50–70 percent to maintain vibrancy, and carefully manage overprinting to prevent colours from appearing muddy.
Proper setup and planning are the keys to achieving vibrant, consistent, and accurate prints. By selecting the right colour system, applying spot colours correctly, checking separations, and coordinating with your printer, you can ensure that your artwork translates perfectly from screen to print, avoiding costly mistakes and producing professional results every time.
If you are unsure whether your artwork is set up correctly for spot colour printing, our team is always happy to help. We can review your files before production, check colour separations, and advise on the most effective way to set up spot colours for your specific project. A quick pre-print check can help avoid costly mistakes, save time, and ensure your final printed result looks exactly as intended.
Need help? Contact us by email or call our team on 01423 881158
