Create square or 4x5 images with black or white frame borders using VIPS

vips-processing.zsh

# Examples:
# squarify_white 2023-10-11.jpg
# 4x5ify_white *.heic

4x5ify() {
  for file in "${@:3}"; do
    if [[ "${file}" == *-4x5-* ]]; then
      continue
    fi
    if [[ $(vipsheader -f height ${file}) != 2580 ]]; then
      vipsthumbnail "${file}" -s 2580x2580 -o temp.v
      target=temp.v
    else
      target="${file}"
    fi
    vips gravity $target "${file:t:r}${2}.${file:t:e}" centre 2160 2700 --background "${1}"
    if [[ "${target}" == temp.v ]]; then
      rm temp.v
    fi
  done
}
squarify() {
  for file in "${@:3}"; do
    if [[ "${file}" == *-square-* ]]; then
      continue
    fi
    if [[ $(vipsheader -f width ${file}) != 2040 ]]; then
      vipsthumbnail "${file}" -s 2040x2040 -o temp.v
      target=temp.v
    else
      target="${file}"
    fi
    vips gravity $target "${file:t:r}${2}.${file:t:e}" centre 2160 2160 --background "${1}"
    if [[ "${target}" == temp.v ]]; then
      rm temp.v
    fi
  done
}
squarify_white() {
  squarify "255" "-square-white" "$@"
}
squarify_black() {
  squarify "0" "-square-black" "$@"
}
squarify_both() {
  squarify_black "$@"
  squarify_white "$@"
}
4x5ify_white() {
  4x5ify "255" "-4x5-white" "$@"
}
4x5ify_black() {
  4x5ify "0" "-4x5-black" "$@"
}
4x5ify_both() {
  4x5ify_black "$@"
  4x5ify_white "$@"
}