Prepress & Color Control Queries, ZQA

Elliptical Dot Shape advantages over Round Dot for smoothness

What are the advantages of the Elliptical Dot Shape compared to the Round Dot Shape in AM screening?

The primary advantage of the Elliptical Dot Shape lies in its ability to produce smoother tonal gradients. Unlike the standard Round Dot, which connects abruptly around the 50% tonal area, the Elliptical Dot is designed to connect more gradually at two points, typically around 30% and 70% of the mid-tone.

This gradual connection prevents the sudden jump in tone (often called 'shoulder') that can be visible when using Round Dots. By distributing the dot connection across a wider tonal range, the Elliptical Dot provides significantly better control over Dot Gain in the critical mid-tone regions. This makes it the preferred setting in the RIP for images with subtle transitions, such as portraits or landscapes, ensuring high-quality output.

Aligned with: FOGRA / Kodak / Idealliance