✨ (img-scripts) Add downsize-for-web script

img-scripts/README.org

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+#+title: Image Helper Scripts
+
+A collection of little bash scripts using [[https://imagemagick.org][ImageMagick]] and [[https://exiftool.org/][exiftool]] for adjusting images.
+
+** social-media-framing
+
+Preparing pictures for sharing on social networks. The image given as first argument is used as a source to create the following three variations:
+
+- No changes, except a maximum resolution of 1920px at the  longest edge (suffix =-regular=)
+- White border to make the image a 1920x1920px square (suffix =-square=)
+- White border to make the image a 1080x1920px portrait orientation "story" (suffix =-story=)
+
+** downsize-for-web
+
+Downsize given image (first argument) for web by converting it to WebP with a maximum resolution of 1920x1920px and a target size of about 350kb.

img-scripts/downsize-for-web.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+BOLD="\033[1m"
+INFO="\033[0;30m\033[47m"
+WORK="\033[0;30m\033[44m"
+DONE="\033[0;30m\033[42m"
+FAIL="\033[0;30m\033[41m"
+NC="\033[0m"
+
+log_info() {
+    echo -e "${INFO} INFO ${NC} $1"
+}
+
+log_work() {
+    echo -e "${WORK} WORK ${NC} $1"
+}
+
+log_done() {
+    echo -e "${DONE} DONE ${NC} $1"
+}
+
+log_fail() {
+    echo -e "${FAIL} FAIL ${NC} $1"
+}
+
+log_info "Welcome to the ${BOLD}downsize-for-web${NC} script."
+log_info "We're using the power of ${BOLD}imagemagick${NC} and ${BOLD}exiftool${NC}."
+
+set +u
+if [[ -z "$1" ]]; then
+    log_fail "Missing filename argument."
+    exit 1
+fi
+set -u
+
+if [[ ! -f "$1" ]]; then
+    log_fail "File with filename $1 not found."
+    exit 1
+fi
+
+filename="$(basename "$1")"
+path="$(dirname "$1")/${filename%%.*}"
+output="$path""-web.webp"
+
+if [[ -f "$output" ]]; then
+    log_done "A downsized image is already available."
+    exit
+fi
+
+log_work "Downsizing image…"
+convert "$1" -resize "1920x1920>" -define webp:target-size=350000 "$output"
+
+log_work "Fixing EXIF metadata"
+exiftool -q -tagsFromFile "$1" "$output"
+
+exiftool -q -delete_original! "$(dirname "$1")"
+log_done "Finished creating downsized web image."

img-scripts/social-media-framing.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+INFO="\033[0;30m\033[47m"
+START="\033[0;30m\033[44m"
+DONE="\033[0;30m\033[42m"
+ERROR="\033[0;30m\033[41m"
+NC="\033[0m"
+
+log_info() {
+    echo -e "${INFO} INFO ${NC} $1"
+}
+
+log_start() {
+    echo -e "${START} START ${NC} $1"
+}
+
+log_done() {
+    echo -e "${DONE} DONE ${NC} $1"
+}
+
+log_error() {
+    echo -e "${ERROR} ERROR ${NC} $1"
+}
+
+log_info "Welcome to the social media framing script."
+log_info "We're using the power of imagemagick and exiftool"
+
+set +u
+if [[ -z "$1" ]]; then
+    log_error "Missing filename argument."
+    exit 1
+fi
+set -u
+
+if [[ ! -f "$1" ]]; then
+    log_error "File with filename $1 not found."
+    exit 1
+fi
+
+filename="$(basename "$1")"
+extension="${filename##*.}"
+path="$(dirname "$1")/${filename%%.*}"
+
+regular="$path""-regular.""$extension"
+square="$path""-square.""$extension"
+story="$path""-story.""$extension"
+
+if [[ ! -f "$regular" ]]; then
+    log_start "Creating regular framing"
+    magick "$1" -resize "1920x1920>" "$regular"
+    log_start "Fixing EXIF metadata"
+    exiftool -q -tagsFromFile "$1" "$regular"
+fi
+
+if [[ ! -f "$square" ]]; then
+    log_start "Creating square framing"
+    magick -define jpeg:size=1920x1920 "$1" \
+           -thumbnail '1890x1890' \
+           -gravity center \
+           -crop 1920x1920+0+0\! \
+           -flatten \
+           "$square"
+    log_start "Fixing EXIF metadata"
+    exiftool -q -tagsFromFile "$1" "$square"
+fi
+
+if [[ ! -f "$story" ]]; then
+    log_start "Creating story framing"
+    magick -define jpeg:size=1080x1920 "$1" \
+           -thumbnail '1050x1890' \
+           -gravity center \
+           -crop 1080x1920+0+0\! \
+           -flatten \
+           "$story"
+    log_start "Fixing EXIF metadata"
+    exiftool -q -tagsFromFile "$1" "$story"
+fi
+
+exiftool -q -delete_original! "$(dirname "$1")"
+log_done "Finished creating framed images"