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bin/genimagecomparisonframes

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#!/usr/bin/env bash
if [[ "$#" -ne 4 ]]
then
echo Side by side image generator
echo By Starbeamrainbowlabs
echo -e "\nUsage:"
echo " ./genframes.sh [leftimage.ext] [rightext.ext] [step] [outdir]"
echo -e "\nNote that the output directory should *not* contain the trailing slash."
exit
fi
i=0
step="$3"
imwidth=1680
imheight=1050
leftimage="$1"
rightimage="$2"
outdirprefix="$4/"
frame=0
while [ $(echo "$i <= 1" | bc) -eq 1 ]
do
nextoffset=$(calc -p "(${imwidth} / 2) * ${i}")
leftpixcount=$(calc -p "$i * $imwidth")
rightpixcount=$(calc -p "$imwidth - $leftpixcount")
framefilename=${outdirprefix}$(printf "%03d" "$frame").jpeg
echo $frame: $leftpixcount / $rightpixcount $framefilename
if [[ $(echo "$leftpixcount == 0" | bc) -eq 1 ]]
then
cp $rightimage $framefilename
elif [[ $(echo "$rightpixcount == 0" | bc) -eq 1 ]]
then
cp $leftimage $framefilename
else
convert $leftimage -crop ${leftpixcount}x${imheight}+0+0 $rightimage -crop ${rightpixcount}x${imheight}+$leftpixcount+0 +append "$framefilename"
fi
frame=$(calc -p "$frame + 1")
i=$(calc -p "$i + $step")
done