Generate random images

generate_heic.sh

#!/bin/bash

WIDTH=4032
HEIGHT=3024
MAX_JOBS=4

# Kill all child processes if user presses Ctrl+C
trap "echo '❌ Interrupted. Cleaning up...'; kill 0; exit 1" SIGINT

generate_image() {
  i=$1
  i=$(printf %03d $i)
  TEXT="photo ${i} heic"
  OUTPUT="photo_${i}.heic"
  echo "Generating $OUTPUT..."

  dd if=/dev/urandom bs=5 count=$((300 * 225)) status=none | \
   magick -size 300x225 -depth 10 rgba:- \
    -filter point -resize ${WIDTH}x${HEIGHT} \
    -gravity center -pointsize 400 -fill white -annotate +0+0 "$TEXT" \
    -alpha off \
    -define heic:compression=hevc -quality 85 "$OUTPUT"
}

job_count=0
for i in $(seq -w 1 500); do
  generate_image "$i" &
  ((++job_count >= MAX_JOBS)) && wait && job_count=0
done

wait
echo "✅ Done generating 500 HEIC files with quality 85."

generate_heic_offset_index.sh

#!/bin/bash

WIDTH=800
HEIGHT=1200
MAX_JOBS=8

# Kill all child processes if user presses Ctrl+C
trap "echo '❌ Interrupted. Cleaning up...'; kill 0; exit 1" SIGINT

generate_image() {
  i=$1
  i=$(printf %03d $(expr 500 + $i))
  TEXT="photo ${i} heic"
  OUTPUT="photo_${i}.heic"
  echo "Generating $OUTPUT..."

  dd if=/dev/urandom bs=3 count=$((WIDTH * HEIGHT)) status=none | \
  magick -size ${WIDTH}x${HEIGHT} -depth 8 rgb:- \
    -gravity center -pointsize 150 -fill white -annotate +0+0 "$TEXT" \
    -alpha off \
    -define heic:compression=hevc -quality 80 "$OUTPUT"
}

job_count=0
for i in $(seq -w 1 500); do
  generate_image "$i" &
  ((++job_count >= MAX_JOBS)) && wait && job_count=0
done

wait
echo "✅ Done generating 500 HEIC files with quality 80."

generate_jpg.sh

#!/bin/bash

MAX_JOBS=12

# Kill all child processes if user presses Ctrl+C
trap "echo '❌ Interrupted. Cleaning up...'; kill 0; exit 1" SIGINT

generate_image() {
  i=$1
  i=$(printf %03d $i)
  TEXT="photo ${i}"
  OUTPUT="photo_${i}.jpg"
  echo "Generating $OUTPUT..."

  dd if=/dev/urandom bs=3 count=$((750 * 500)) status=none | \
  magick -size 750x500 -depth 8 rgb:- \
    -filter point -resize 1500x1000 \
    -gravity center -pointsize 200 -fill white -annotate +0+0 "$TEXT" \
    -alpha off \
    -quality 100 "$OUTPUT"
}

job_count=0
for i in $(seq -w 1 500); do
  generate_image "$i" &
  ((++job_count >= MAX_JOBS)) && wait && job_count=0
done

wait
echo "✅ Done generating 500 JPG files."

generate_jpg_offset_index.sh

#!/bin/bash

MAX_JOBS=12

# Kill all child processes if user presses Ctrl+C
trap "echo '❌ Interrupted. Cleaning up...'; kill 0; exit 1" SIGINT

generate_image() {
  i=$1
  i=$(printf %03d $(expr 500 + $i))
  TEXT="photo ${i}"
  OUTPUT="photo_${i}.jpg"
  echo "Generating $OUTPUT..."

  dd if=/dev/urandom bs=3 count=$((750 * 500)) status=none | \
  magick -size 750x500 -depth 8 rgb:- \
    -filter point -resize 1500x1000 \
    -gravity center -pointsize 200 -fill white -annotate +0+0 "$TEXT" \
    -alpha off \
    -quality 100 "$OUTPUT"
}

job_count=0
for i in $(seq -w 1 500); do
  generate_image "$i" &
  ((++job_count >= MAX_JOBS)) && wait && job_count=0
done

wait
echo "✅ Done generating 500 JPG files."