Script used to update each image for my plant timelapse https://www.youtube.com/watch?v=_WLxC3imytk

timelapse-plant-script.sh

#! /bin/bash

# This script expect a image file as first argument, and a destination directory as second.
# It will:
# - rotate the image 0.4deg
# - crop to a ratio for HD (1920*1080)
# - add the timestamp in the top right corner
# This timestamp is in the format "xXh yYm", and computed from a time of the day extracted from the first image
# of the directory. All images are the same day, so it's easier.
# It's printed in white with a soft black shadow.
# Used with parallel: parallel -j 8 'prepare-img.sh "source/{}" prepared' ::: *.JPG

FILE=$1
DEST_DIRECTORY=$2

echo_stderr ()
{
    echo ERROR: "$@" >&2
}

if [ ! -f "$FILE" ]
then
	echo_stderr "The given file does not exist"
	exit 1
fi

if [ ! -d "$DEST_DIRECTORY" ]
then
	echo_stderr "The given directory does not exist or is not a directory"
	exit 1
fi


TIME=$(exif -m -t DateTimeOriginal "$FILE" | cut -d ' ' -f2)
HOUR=$(echo $TIME | cut -d : -f1)
MINUTE=$(echo $TIME | cut -d : -f2)
SECOND=$(echo $TIME | cut -d : -f3)

DELTA_FIRST=44775  # 12h26mn15s (time of first image) in seconds
DELTA=$(bc <<< "$HOUR*3600+$MINUTE*60+$SECOND-$DELTA_FIRST")
DELTA_HOUR=$(bc <<< "$DELTA/3600")
DELTA_MINUTE=$(bc <<< "($DELTA%3600)/60")

DELTA_PRINT=$(printf "%2dh %2dm" $DELTA_HOUR $DELTA_MINUTE)

convert -size 550x300 xc:none -gravity northwest -pointsize 150 -stroke none -strokewidth 0 -annotate 0 "$DELTA_PRINT" -background none -shadow 40x5+0+0 +repage -stroke none -fill white  -annotate 0 "$DELTA_PRINT" \( -rotate 0.4 +repage -crop 4562x2566+20+867 $FILE \) +swap -gravity northeast -geometry +100+100 -composite "$DEST_DIRECTORY"/"$FILE"