Annotation with Imagemagick (Watermark -ish)

Processing
6

Since I liked the original script from @patdavid very much, I decided to expand on it for my own use and to share the results here.
The added functionality is:

  • You can pass several images to the script as parameters.
  • The footer color is the average color of the image. This shoud make it blend better with the image.
  • The footer, logo and font size are calculated in relation to the image height.
  • The image is resized to the original height. This can be useful if you already resized the images to fit a certain purpose, like social media or a specific screen size.
  • Two different font colors and logos can be defined. Bright and dark. This can help to have more contrast between the footer and the text and logo.
  • On the right side the comment of the image, as found in the “usercomment” or “comment” tags, is printed.

Enjoy.

#!/bin/bash

#---------------------------------------------------------------------------
# Variables.
#---------------------------------------------------------------------------

MULTIPLIER=0.05 # Percentage of the image height the footer height will be.
LOGOMULTIPLIER=0.04 # The size of the logo in relation to the image height.
POINTSIZEMULTIPLIER=0.020 # Font size in relation to the image height.
HORIZONTAL_OFFSET=0.015 # How far to indent the logo and text relative to the image height.
LOGODARK="/path/to/your/dark_logo.png"
LOGOBRIGHT="/path/to/your/bright_logo.png"
FONTDARK="srgb(10%,10%,10%)"
FONTBRIGHT="srgb(90%,90%,90%)"
COPYRIGHTHOLDER="Your Name Here"
COMMENTTAG="usercomment" # Change this to 'comment' if if you use that tag.
PREFIX="pixls.us_" # The prefix for the new files.
FORMAT=jpg # Define the output format here.

############################################################################
# WARNING: ONLY TOUCH STUFF BELOW THIS POINT IF YOU KNOW WHAT YOU ARE  DOING.
############################################################################

#---------------------------------------------------------------------------
# Here we go.
#---------------------------------------------------------------------------

for i in "$@"
do

    # Extract height and width of the image.
    WIDTH=$(identify -quiet -format "%w" "$i")
    HEIGHT=$(identify -quiet -format "%h" "$i")

    # Calculate footer height (FH).
    FH="$(echo "$HEIGHT*$MULTIPLIER" | bc)"

    # Calculate new image height without logo (IH).
    IH="$(echo "$HEIGHT-$FH" | bc)"

    # Calculate logo height (LH).
    LH="$(echo "$HEIGHT*$LOGOMULTIPLIER" | bc)"

    # Extract the value of the comment tag.
    COMMENT=$(exiftool -s -s -s -m -"$COMMENTTAG" "$i")

    # Extract the average color of the image to use as fill.
    FILL=$(convert "$i" -quiet -scale 1x1\! -format '%[pixel:s]' info:-)

    printf " "$i": Dark or bright logo and font? [D/B]" ; read -e -p ": " CHOICE

    case $CHOICE in
            [dD]* )
                    TEXTCOLOR="$FONTDARK"
                    LOGO="$LOGODARK"
            ;;

            * )
                    TEXTCOLOR="$FONTBRIGHT"
                    LOGO="$LOGOBRIGHT"
            ;;

    esac

    # Calculate the pointsize (PS).
    PS="$(echo "$HEIGHT*$POINTSIZEMULTIPLIER" | bc)"

    # Get the year for the copyright notice.
    FULLDATE=$(exiftool -s -s -s -CreateDate "$i")
    YEAR=${FULLDATE:0:4}

    # Calculate horizontal comment offset (HO).
    HO="$(echo "$WIDTH*$HORIZONTAL_OFFSET" | bc)"

    # Calculate horizontal logo offset (LO).
    LO="$(echo "$WIDTH*$HORIZONTAL_OFFSET*0.75" | bc)"

    # Calculate horizontal copyright offset (CO)
    LOGOWIDTH=$(identify -quiet -format "%w" "$LOGO")
    LOGOHEIGHT=$(identify -quiet -format "%h" "$LOGO")
    RATIO="$(echo "$LOGOHEIGHT/$LH" | bc -l)"
    LW="$(echo "$LOGOWIDTH/$RATIO" | bc)"
    CO="$(echo "($LO*2)+$LW" | bc)"

    # Do the magic on the image.
    convert "$i" -resize x$IH \
        \( +clone \
            -quiet \
            -fill "$FILL" \
            -draw 'color 0,0 reset' \
            -resize x$FH! \
            -fill "$TEXTCOLOR" \
            -pointsize "$PS" \
            -gravity east \
            -annotate +$HO+0 "$COMMENT" \
            -gravity west \
            -annotate +$CO+0 "© $YEAR $COPYRIGHTHOLDER" \
            -gravity west \
                \( "$LOGO" -resize x$LH \) \
            -geometry +$LO+0 -composite \) \
        -append "$PREFIX""${i%.*}"."$FORMAT"
done
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