Common Problems in Color Separation (Expanded English Version)

Color separation plays a crucial role in ensuring accurate and high-quality printing output. Below are the common issues frequently encountered during the color-separation process and the challenges they may introduce:

1. Insufficient image resolution

Low-resolution files result in blurred or jagged printed images. The problem becomes more obvious when the image is enlarged during layout.

2. Original files saved in JPEG format

JPEG uses lossy compression, which destroys image details and creates visible artifacts. This significantly affects color accuracy and tonal reproduction in the separated file.

3. Images already converted from RGB to CMYK

Improper RGB-to-CMYK conversion can cause color loss, dull hues, and distortion. Bright and highly saturated areas are most vulnerable to visible degradation.

4. Images based on incorrect or mismatched ICC profiles

Wrong ICC profiles disrupt color consistency across devices. This can lead to unwanted warm/cool shifts or an overall grayish appearance in the final print.

5. Images obtained through scanning printed materials

Scanned images often contain moiré patterns, color casts, low contrast, and a lack of detail. These issues require extensive correction before color separation.

6. QuarkXPress or Illustrator documents containing numerous EPS files with inconsistent attributes

If EPS files come from different settings or color modes (e.g., mixed RGB and CMYK), color separation may become inconsistent, leading to output errors and printing color shifts.

7. Placed files created with different software versions or color-management settings

Different program versions use different rendering engines and color-management rules, causing the same image to display different colors across environments and impairing final color consistency.

In summary, color-separation issues are closely related to source files, color management, layout structure, output format, and the printing workflow.
By understanding these components and addressing problems systematically, print providers can significantly improve color accuracy, reduce production risks, and achieve higher efficiency and profitability.