Watermark Your Images from Command-line Interface
I wrote a bash script that can be run as a command to watermark image or images within the given directory using ImageMagick.
bash#!/usr/bin/env bash
# Check if source directory or image file and watermark text are provided
if [ $# -eq 0 ]; then
echo "Usage: $0 <source_dir_or_image_path> [<watermark_text>]"
exit 1
fi
# Set watermark text to "@ShinChven" if not given
if [ -z "$2" ]; then
watermark_text="@ShinChven"
else
watermark_text="$2"
fi
# Create watermark_images directory under the source directory (if a directory path is used)
if [ -d "$1" ]; then
mkdir -p "$1/watermark_images"
elif [ -f "$1" ]; then
mkdir -p "$(dirname "$1")/watermark_images"
fi
# Function to add watermark to a single image file
function watermark_image {
# Add watermark to image and save to watermark_images directory
watermarked_image="$1/watermark_images/$(basename "$2")"
convert "$2" -gravity center -strip -pointsize 36 -fill 'rgba(255,255,255,0.3)' -draw "text 0,0 '$3'" "$watermarked_image"
echo "Watermarked $2 to $watermarked_image"
}
# Check if source path is a file
if [ -f "$1" ]; then
# Check if file is an image
if [[ "$1" == *.jpg || "$1" == *.jpeg || "$1" == *.png ]]; then
watermark_image "$(dirname "$1")" "$1" "$watermark_text"
else
echo "Error: $1 is not an image file"
exit 1
fi
elif [ -d "$1" ]; then
# Loop through all images in the source directory
for image in "$1"/*.jpg "$1"/*.jpeg "$1"/*.png; do
# Check if image is a file
if [ -f "$image" ]; then
watermark_image "$1" "$image" "$watermark_text"
fi
done
else
echo "Error: $1 is not a valid file or directory"
exit 1
fi
Before using the script, make sure you have ImageMagick installed. You can install it using brew install imagemagick on macOS or sudo apt-get install imagemagick on Ubuntu.
And please replace your default watermark_text in the script with your own default watermark.