Bash script to convert images for use with Supernote A6X and A5X

sn-convert-img

#!/usr/bin/bash
################################################################################
#
#  Description:
#   Convert images for compatibility with the Supernote A6X and A5X.
#
#   If an original image's size exceeds the ratio required to be compatible
#   with the Supernote, it will automatically be centered and cropped.
#
#  Usage:
#   sn-convert-img path/to/img.ext
#
#  Requirements:
#   • imagemagick [https://imagemagick.org]
#
#  Installation:
#   • Install imagemagick [https://imagemagick.org/script/download.php]
#   • Copy script into your PATH
#   • Make sure the script is executable (i.e. `chmod +x <this script>`)
#
#  Author:
#   Name: Tim Loyer
#   Email: [email protected]
#   GitHub Profile: https://github.com/TimothyLoyer
#
################################################################################

# Bash strict mode.
set -euo pipefail

# Prefix to add to the output file. This is helpful when the source image
# format is .png to avoid overwriting the source file.
output_prefix="sn-"

# Required settings for compatibility with Supernote.
sn_dimensions="1404x1872"
sn_format="png"

# Rename the input argument, which should be a source file.
path=$1

# Get the file name from the input path.
input_file=${path##*/}

# Generate a filename for the converted image.
output_file="${output_prefix}${input_file%.*}.${sn_format}"

echo "Converting ${input_file} to Supernote compatible size and format…"

# Convert using imagemagick
convert "${path}" -resize ${sn_dimensions}^ -gravity center -extent ${sn_dimensions} "${output_file}"

echo "Conversion complete as ${output_file}"