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#!/bin/sh
# 16:9 screen resolution ratio
wratio=16
hratio=9
chopnum=99%
width=$(identify -format '%w' "$1")
height=$(identify -format '%h' "$1")
dim=$(echo "$width*100/$height" | bc)
if [ "$dim" -ne 177 ]; then
if [ "$dim" -lt 177 ]; then
chopgeom="${chopnum}x0"
width=$(echo "$height*$wratio/$hratio" | bc)
else
chopgeom="0x${chopnum}"
height=$(echo "$width*$hratio/$wratio" | bc)
fi
extgeom="${width}x${height}"
bgcolor=$(convert "$1" -gravity center -chop "$chopgeom" -define histogram:unique-colors=true -format %c histogram:info:- | sort -rn | head -n1 | awk \{print\ \$3\} | cut -c1-7)
convert "$1" -gravity center -background "$bgcolor" -extent "$extgeom" "$2"
else
echo 'same resolution ratio, no need to convert' >&2
exit 1
fi
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