-- card: 52508 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 2792
-- name: glossary 2
----- HyperTalk script -----
on closecard
  global maploc, cardloc
  put word 1 of the short name of this card into maploc
  put word 2 of the short name of this card into cardloc
end closecard



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Macintosh Display Card 4•8 and 8•24

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Glossary

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Convolution

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glossary3

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Convolution is a formula that averages a pixel with the neighboring pixels that reside above and below that pixel.  

Convolution causes a blurring effect between scan lines so that any horizontal line contains at least a portion of the scan lines above and below it.  A portion of the horizontal line remains visible to avoid flicker.

The convolution formula follows a 1:2:1 ratio where the current pixel has twice the weight of its neighbors.