42 lines
1.2 KiB
Bash
42 lines
1.2 KiB
Bash
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#!/bin/bash
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#iWidth 323 = oWidth 404
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#iHeight 242 = oHeight 374
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DIGITS=6
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SCALE=$(echo "scale=$DIGITS; 323/404" | bc)
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OUTER=$(echo "scale=$DIGITS; 374/404" | bc)
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RATIO=$(echo "scale=$DIGITS; 242/323" | bc)
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if [[ "${1}" != "" ]]; then
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DPI=${1}
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else
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echo "Please provide DPI as first argument"
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exit 1
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fi
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if [[ "${2}" == "" ]]; then
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echo "Please provide input image as second argument"
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exit 2
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fi
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if [[ "${3}" == "" ]]; then
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echo "Please provide output image as third argument"
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exit 3
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fi
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DIM=$(identify -ping -format '%w %h' "${2}")
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WIDTH=$(echo ${DIM} | awk '{print $1}')
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HEIGHT=$(echo ${DIM} | awk '{print $2}')
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R=$(echo "scale=${DIGITS};${HEIGHT}/${WIDTH}" | bc)
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OW=$(echo "scale=${DIGITS};${DPI}*(404/96)" | bc | awk -F'.' '{print $1}')
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OH=$(echo "scale=${DIGITS};${DPI}*(374/96)" | bc | awk -F'.' '{print $1}')
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IW=$(echo "scale=${DIGITS};${OW}*${SCALE}" | bc | awk -F'.' '{print $1}')
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IH=$(echo "scale=${DIGITS};${IW}*${R}" | bc | awk -F'.' '{print $1}')
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TMP=$(mktemp -d)
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convert -size ${OW}x${OH} xc:#FFFFFF "${TMP}/white.png"
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convert "${2}" -resize ${IW}x${IH} "${TMP}/resize.tif"
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composite -gravity Center "${TMP}/resize.tif" "${TMP}/white.png" "${3}"
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rm -rf "${TMP}"
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echo "Centered in white ${2} -> ${3}"
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