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

This commit is contained in:
Marcel Kapfer 2025-03-13 19:04:02 +01:00
parent 120739bff3
commit 4bfbc50b90
Signed by: mmk2410
GPG key ID: CADE6F0C09F21B09
4 changed files with 74 additions and 7 deletions

15
img-scripts/README.org Normal file
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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.

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img-scripts/downsize-for-web.sh Executable file
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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."

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#+title: Social Media Framing
A little bash script using [[https://imagemagick.org][ImageMagick]] and [[https://exiftool.org/][exiftool]] for 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=)