source

sampling matrix
width PAR
height
cropT
LR
B
or mplayer style
width:height:left:top

target

requested
width PAR
mod
w
h

pad or crop to
width
height

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notes | changelog

examples
PAL (702) to square with mod(1) resizing
Panasonic dvx100 16:9LB to web square

external links
resizing theory | doom9 PAR | surreal *