How does blending work?

A blended projection system requires the projectors to be positioned so that their images overlap.

There are three main parts to creating a successful blend.

1. Image Alignment

The projectors must be physically positioned and adjusted so their images line up correctly. This includes image size, focus, geometry, and the position of the overlapping areas.

2. Image Overlap and Brightness Adjustment

Where two projected images overlap, the combined light output would normally make that area brighter than the rest of the screen.

Edge blending compensates for this by gradually reducing the contribution of each projector through the overlap region. The goal is to maintain consistent brightness across the entire image.

3. Image Mapping and Content

The video content must be divided and distributed correctly between the projectors.

Each projector displays its assigned portion of the overall image, including the shared overlap area. The projection system must account for this overlap when determining the final image dimensions and mapping.