Automatically generate web versions of high quality TIFF images placed in a given directory (with fswatch)

generateWebVersions.sh

# Generates varying exports of a TIFF image
# for different web uses: one high quality
# image for Flickr and two scaled-down lower-quality
# versions for posting to blogs, Twitter, etc...
#
# Only operates on TIFF images because I wanted
# to preserve as much quality as I could until the
# end and also because I don't want to allow a loop
# on the output of this file triggering a new run.
#
# Intended to be used with fswatch (https://github.com/emcrisostomo/fswatch)
# This will automatically generate web versions of any TIFF images
# saved into the running directory and delete the high quality
# source TIFFs.
#
# Example
# fswatch -0 -e Flickr/ -e Blog-half/ -e Blog-1200x/ . | xargs -0  -n1 -I {} ./generateWebVersions.sh {}
#
# Touch `clean` to wipe out the generated images, useful for
# starting fresh on an export to another album
#
# Author: Dennis Snell ([email protected])

FILE=$(basename "$1")
NAME=$(basename "$FILE" .tif)
TYPE=$(file --brief --mime-type "$FILE")

if ! [ -f "$FILE" ]; then
	exit 1
fi

if [[ "clean" == "$FILE" ]]; then
	rm -rf Flickr
	rm -rf Blog-half
	rm -rf Blog-1200x
	rm clean
	exit 0
fi

if ! [[ "image/tiff" == $TYPE ]]; then
	exit 1
fi

if ! [ -d "Flickr" ]; then
	mkdir Flickr
fi

if ! [ -d "Blog-half" ]; then
	mkdir Blog-half
fi

if ! [ -d "Blog-1200x" ]; then
	mkdir Blog-1200x
fi

echo "Optimizing ${1}"

function t2j () {
	local QUALITY=$1; shift
	local BASE_DIR=$1; shift
	convert "${FILE}" -quality $QUALITY $@ "${BASE_DIR}/${NAME}.jpg" 2>/dev/null
}

function optimize () {
	local QUALITY=$1; shift
	local BASE_DIR=$1; shift
	jpegoptim "${BASE_DIR}/${NAME}.jpg" -m$QUALITY $@
}

# Flickr
t2j 90 Flickr
optimize 90 Flickr --all-progressive

# Half-width images
t2j 98 Blog-half -resize 50% -filter box
optimize 87 Blog-half -s --all-progressive

# 1200 pixel wide images
t2j 98 Blog-1200x -resize 1200x
optimize 87 Blog-1200x -s --all-progressive

rm "$FILE"
exit 0