ACF FounderLesson 4/8 · Incident reportPT-BR
Visual course · v2 pet

From chroma to clean transparency

Explain why removing the background is not enough.

Core idea

Cyan is a temporary tool for separating character and background. After extraction, despill removes colored edge contamination without changing the alpha channel.

Think of it this way: Cutting out removes the wrapping paper; despill cleans the fibers left on the edge.

8 columns × 11 rows · last two rows = 16 look directions

How to read it

Generate on #00FFFF.
Extract components cell by cell.
Apply one local edge despill and prove alpha was preserved.

Technical layer

The edge-local-chroma-spill-suppression pass changed 141,218 edge pixels, preserved alpha, and ended with zero chroma fringe pixels in validated cells.

Check your mental model

What must despill preserve?

Evidence used

run-summary.json · validation-extended.json · review.json