theotheroracle/icon-split
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Bit Borealis 2023-07-25 10:37:50 +00:00
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#!/bin/sh
#This script will merge two jpg images into one using imageMagick.
#The final result will be a picture that is split diagonally.
#The diagonal line will start from the bottom left of the image.
#Both pictures must be of the same size.
#If you do not give the filenames as part of the command line, the default names will be used (Left.jpg and Right.jpg).
#If command line argument 1 is not provided, the value will default to the variable $LEFT_DEFAULT
LEFT_DEFAULT="Left.jpg";
LEFT=${1:-$LEFT_DEFAULT};
#If command line argument 2 is not provided, the value will default to the variable $Right_DEFAULT
RIGHT_DEFAULT="Right.jpg";
RIGHT=${2:-$RIGHT_DEFAULT};
#The intermediate images we will use must be png to support transparency.
#We remove the extension '.jpg' from the filenames and add the extension '.png'.
LEFT_NORM="${LEFT%.jpg}.norm.png"
RIGHT_NORM="${RIGHT%.jpg}.norm.png"
LEFT_OUT="${LEFT%.jpg}.Diagonal Up - Mask.png";
RIGHT_OUT="${RIGHT%.jpg}.Diagonal Up - Mask.png";
OUT="combined.png";
# #Read the width and height of one of the images
WIDTH_LEFT=$(identify -format %w "$LEFT");
HEIGHT_LEFT=$(identify -format %h "$LEFT");
WIDTH_RIGHT=$(identify -format %w "$RIGHT");
HEIGHT_RIGHT=$(identify -format %h "$RIGHT");
# Find the smallest width and height of both images
WIDTH=$((WIDTH_LEFT < WIDTH_RIGHT ? WIDTH_LEFT : WIDTH_RIGHT))
HEIGHT=$((HEIGHT_LEFT < HEIGHT_RIGHT ? HEIGHT_LEFT : HEIGHT_RIGHT))
# Normalize their sizes to those smallest dimensions
convert "$LEFT" -background none -resize "$WIDTH"x"$HEIGHT"^ -gravity center -extent "$WIDTH"x"$HEIGHT" "$LEFT_NORM"
convert "$RIGHT" -background none -resize "$WIDTH"x"$HEIGHT"^ -gravity center -extent "$WIDTH"x"$HEIGHT" "$RIGHT_NORM"
convert -respect-parenthesis \
\( "$LEFT_NORM" -gravity north -crop "$WIDTH"x"$HEIGHT"+0+0 +repage -write "$LEFT_OUT" \) `#Load first image to a new png` \
\( "$RIGHT_NORM" -gravity east -crop "$WIDTH"x"$HEIGHT"+0+0 +repage -write "$RIGHT_OUT" \) `#Load second image to a new png` \
\( -size "$WIDTH"x"$HEIGHT" xc:black -fill white -draw "polygon 0,0 0,"$HEIGHT" "$WIDTH",0" -write "MASK_$LEFT_OUT" \) `#Create the mask of the upper triangle` \
\( -clone 2 -negate -write "MASK_$RIGHT_OUT" \) `#Create the mask of the lower triangle` \
\( -clone 0 -clone 2 -alpha off -compose copy_opacity -composite -write "$LEFT_OUT" \) `#Apply the upper triangle mask to the left image` \
\( -clone 1 -clone 3 -alpha off -compose copy_opacity -composite -write "$RIGHT_OUT" \) `#Apply the lower triangle mask to the right image` \
-delete 0-3 -compose over -composite "$OUT" `#Merge the two images together`;
#Cleaning up
rm "MASK_$RIGHT_OUT" "MASK_$LEFT_OUT" "$LEFT_OUT" "$RIGHT_OUT" "$LEFT_NORM" "$RIGHT_NORM";