Spectral Data is applied in printing by first defining brand and spot colors using their unique spectral fingerprints. This allows print shops to scientifically guarantee that colors like a specific corporate blue are replicated accurately anywhere in the world, ensuring perfect Color Management and consistency.

Relying solely on Delta E is considered outdated because Delta E is merely a single number representing the distance between two colors in a color space (like L*a*b*). While useful, it doesn't reveal how the color mismatch occurred (e.g., more yellow or less cyan). Spectral Data, conversely, shows the entire curve, allowing technicians to identify the exact ink component causing the drift and making precise corrections, thus pushing the quality standard far beyond the limitations of older methods.