initial commit

icon-split

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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";