Final Result: https://gfycat.com/BitterRichHippopotamus
$./paperEmboss.sh [input_file_or_path]
$output filename: [input_filename-emboss.original_extension]
Fred's script shadowhighlight is not mandatory. Set shlgPath to use different path other than bin or current folder. (Remove for loop to disable checking for the script.)
5 images would been made in /tmp, as I'm not good with cache function yet.
Final result would move to current folder. ie test.png becomes test-emboss.png.
Increase the exposure variable will make change the contrast but grayer color-tone. The brightness and contrast function is not straight foward as gimp.
Image with transparency will replaced by white background in the result. (To keep the alpha channel, comment out the line with mogrify)
*Script below does not support multiple inputs or flags, only basic error check.
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~4th-revision~
#!/usr/bin/env bash
# usage: ./paperEmboss.sh input_file
exposure=10% # bigger value for more contrast, but grayer.
shlgPath=~/Downloads/shadowhighlight #'full_path/shadow'
input="$1";
# check input
if [ ! -f "$input" ]; then echo "null file;nothing done";exit 1; fi
filename=$(basename -- "$input")
ex=".${filename##*.}" #file extension
output="${filename%.*}-emboss$ex"
# output to current_dir/filename-emboss.original_extension
#a=ts;b=twc;c=t-edge;d=t-edge2;e=tshb;f=t-whiteEmboss
fname=(ts t-edge t-edge2 tshb t-whiteEmboss)
# export files to /tmp/
ct=-1;for i in {a..e};do ct=$ct+1; eval "$i=/tmp/${fname[$ct]}$ex";done
## start here
# check shadowhighligh, in bin, current folder, or $shlgPath.
shlg=shadowhighlight;
for p in $shlg ./$shlg $shlgPath; do
if which "$p" >/dev/null; then
xp="$p"; echo 'use '$xp
$xp -sa 60 -ha 60 -ma 70 $input $a # sharpen, fred script;
break;
fi
done
[ -z $xp ] && a=$input; #if not, skip
# edge detect
convert $a -colorspace gray -canny 0x1+10%+30% $b
# thicker edge
convert $b \
\( -clone 0 -roll +1+0 -clone 0 -compose difference -composite \) \
\( -clone 0 -roll +0+1 -clone 0 -compose difference -composite \) \
-delete 0 -compose screen -composite $c
# add blur shadding
convert $c -blur 0x2 -shade 90x75 $d
# emboss like looks
convert $d $c \
-alpha Off -compose CopyOpacity -composite \
-evaluate subtract "$exposure" $e
# if transparent, flatten
picinfo=$(identify -format '%[channels]\n' $e)
[[ $picinfo =~ "a" ]] && mogrify -flatten -background white $e;
# move image to current folder
mv $e $output; echo "output filename: $output "
exit
Animation was created by Fred's SplitImage script
./splitimage -m TB -i 10 -r 40 test.jpg test-emboss.jpg polo-card.gif
in=polo-card.gif; fps=4;
ffmpeg -i $in -r $fps -c:v libvpx -quality good -b:v 0 -crf 15 \
-pix_fmt yuv420p -movflags faststart -tile-columns 2 ${in%.*}.webm
Ref:
edge detect: https://imagemagick.org/discourse-server/viewtopic.php?t=25405
shade_blur 3rd example (emboss): https://www.imagemagick.org/Usage/transform/#shade_blur
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Check script exist: if-either, if missing one of them, hash check
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fred emboss, bevel