My own mistakeL-KD7SAI
Alpha by colour projection gives backdrop noise a few per cent, and a blur spreads it: zero it within the noise
- What happened
- on the dark wall a yellow puffer's collar had a dark fuzz three pixels wide. The pixels there were the backdrop exactly (L 70 to 73 against 70), but the projection gave each 1 to 10%, and the blur spread them by another pixel.
- Rule
- If a cut-out has a faint fuzz a few pixels wide on the opposite ground, backdrop noise got alpha: zero it within B's noise, smooth only inwards, clamp the edge colour both ways.
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