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