Edge Blending

Edge blending smooths the overlap between two or more adjacent display outputs so they appear as one continuous image. Without blending the overlap reads as a bright seam — two outputs add up to roughly double the surrounding brightness. WATCHOUT fades each output's edge with a complementary gradient so the combined brightness in the overlap matches the rest of the image.

Automatic Soft Edges

Edge blending in WATCHOUT is fully automatic. WATCHOUT detects where 2D Displays overlap on the Stage and generates the soft-edge gradients in those regions. Enable it in Device Properties → Mask → Automatic Softedges.

The generated gradients are not user-editable. The only operator control is the Gamma Correction slider (range 0.5–1.5, default 1.0), which shapes the falloff curve.

Gamma Correction

WATCHOUT encodes each display's output through an OETF chosen by that display's Color Space setting. The projector decodes the signal with its own EOTF. If the two curves do not match, the centre of each overlap reads too dark or too bright.

One common case: WATCHOUT outputs Rec. 709 but the projector decodes with a gamma 2.4 EOTF. The overlaps come out slightly darker than the surrounding white, and a Gamma Correction of about 1.1 brings them back. The opposite mismatch produces a bright band, fixed by lowering the value below 1.0.

To find the right value, multi-select all displays in the overlap and put them in Masked mode. Adjust the slider until the overlap matches the surrounding brightness. Multi-select changes every selected display's gamma at once — adjusting them one at a time is slower and harder to keep consistent.

Practical Tips

• Use sufficient overlap — 10–20 % of projector width works well. Below 5 % is hard to blend invisibly.
• Calibrate white points first. Use the per-display White Point (R, G, B) sliders to match colour temperature between projectors before turning on soft edges. This is the only pre-blend correction needed.