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- #!/usr/bin/env bash
- set -euo pipefail # bash strict mode
- # high="$1" # High image (full-size original view)
- # low="$2" # Low image (thumbnail) (should be the same size)
- # output="output.png"
- # [ ! -z "$3" ] && output="$3" # Output image
- # size=$(convert "$high" -format "%wx%h" info:)
- # convert "$high" -alpha off +level 3.5%,100% -gamma 20 high_gamma.png
- # low_gamma="-alpha off -gamma 0.8 +level 0%,77%"
- # convert \( "$low" $low_gamma \) high_gamma.png \
- # -compose Mathematics -define compose:args='0,-0.33,1,0.33' \
- # -composite low_adjusted.png
- # convert low_adjusted.png high_gamma.png -size $size pattern:gray25 -composite \
- # -set gamma 0.022727 -define png:include-chunk=none,gAMA "$output"
- # rm high_gamma.png low_adjusted.png
- # this autoscales image or some shit (better than the above)
- [ -z "$1" -o -z "$2" ] && echo "Need 2 input images." && exit 1
- [ -z "$3" ] && out="out.png" || out="$3"
- ffmpeg \
- -loglevel 'error' \
- -y \
- -i "$1" \
- -i "$2" \
- -filter_complex \
- "`echo \
- 'color=c=black[mask];' \
- '[mask][0:v]scale2ref[mask][main];' \
- '[1:v][main]scale2ref[scnd][main];' \
- '[mask]drawgrid=w=2:h=2:c=white,format=rgb24[mask];' \
- '[main]colorlevels=romin=0.01:gomin=0.01:bomin=0.01' \
- ':romax=0.21:gomax=0.21:bomax=0.21,eq=gamma=10.0,eq=gamma=1.4' \
- ',format=rgb24,split[main][temp];' \
- '[scnd]colorlevels=romin=0.0:gomin=0.0:bomin=0.0' \
- ':romax=0.8:gomax=0.8:bomax=0.8,eq=gamma=0.7,format=rgb24[scnd];' \
- '[temp][scnd]blend=all_expr='"'B - 0.33*A + 84'"',format=rgb24[scnd];' \
- '[main][scnd][mask]maskedmerge[vout]'`" \
- -frames:v 1 \
- -c:v png \
- -f image2 \
- -map '[vout]' \
- - | \
- convert \
- - \
- -set 'gamma' '0.027' \
- -define 'png:include-chunk=none,gAMA' \
- "$out"
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