insert_chars.sh

#!/bin/bash
FROM="山田_太郎"
POSTAL1="5_4_1"
POSTAL2="0_0_4_4"
ADDR1="大阪市_中央区"
ADDR2="伏見町_4-4-9"
TEL1="06"
TEL2="7878"
TEL3="6838"
TO="吉田_篤"

OUTPUT="output.png"
MATERIAL="material.png"

convert sample.gif $OUTPUT

LABELS=(
    "$FROM    +110+165 14"
    "$POSTAL1 +93+183  20"
    "$POSTAL2 +154+183 20"
    "$ADDR1   +100+226 14"
    "$ADDR2   +100+247 14"
    "$TEL1    +110+207 14"
    "$TEL2    +150+207 14"
    "$TEL3    +180+207 14"
    "$TO      +110+267 14"
)

for LABEL in "${LABELS[@]}";do
    LABEL=($LABEL)    
    SIZE="${LABEL[2]}"
    POSITION="${LABEL[1]}"
    LABEL=$(echo ${LABEL[0]} | sed -e 's/_/ /g')

    convert \
        -fill "#000000"  \
        -font /Library/Fonts/Osaka.ttf \
        -transparent white \
        -pointsize "$SIZE" \
        label:"$LABEL" \
        $MATERIAL
    convert $OUTPUT $MATERIAL -geometry $POSITION -composite $OUTPUT
done