How to Watermark Images and Videos

By  on  

As a content creator I respect an author or artist's desire to protect their work.  I don't consider this blog art but I'm annoyed as hell when I see my blog posts show up on another site.  I'm lucky enough that my blog is mostly recreational but many people rely on their work for a living, especially photographers and graphic artists.  One (weak) way to intellectually protect your work is by watermarking art, from imagery to video and more.  Let me show you how you can watermark basic images, animated GIFs, and videos!

Watermark an Image

How to Watermark an Image

The best way to watermark an image from command line is ImageMagick.  It will be easiest to show you the command and then explain it, so here we go:

composite -gravity southeast -geometry +10+10 -dissolve 75% watermark.png ringo.jpg ringo-watermarked.jpg
  • We'll use the composite utility instead of ImageMagick's popular convert
  • -gravity represents the direction within the image where the watermark should appear
  • geometry represents x and y padding offsets from the gravity position
  • -dissolve represents the opacity level of the watermark

The last three arguments represent the watermark, the source image, and the merged output image name.

If you're looking to watermark an entire directory of images, you can use this helpful shell script:

ls -1 source/photo_*.jpg \
    | awk -F\/ '{print "$COMPOSITE -gravity southeast watermark.png source/"$(NF)" watermarked/"$(NF)}'

This shell script was found at http://www.the-art-of-web.com/system/imagemagick-watermark/

Watermark an Animated GIF

How to Watermark an Animated GIF

Animated GIFs are another beast:  if you try to watermark them with the ImageMagick method used for a static image, you'll simply get the result of the first frame.  Watermarking an animated GIF will take a differnet ImageMagick tactic:

convert wtf.gif -coalesce -gravity southeast -geometry +10+10 null: watermark.png -layers composite -layers optimize wtf-watermarked.gif

To treat an animated GIF, we'll use the convert utility to kick off the process but still use composite to layer the GIF and watermark.

Watermark a Video

Videos require another utility for watermarking:  ffmpeg.  It impossible to write a better post than Kevin Sloan's Watermarking Videos from the Command Line with FFMPEG Filters, so I'll simply cite his post:

./ffmpeg -i wtf.mpg -i watermark.png -filter_complex "overlay=10:10" wtf-watermarked.mpg

As mentioned above, Kevin's post is top class -- be sure to read it if you're looking for more detailed options and examples.

Watermarking is an important part of intellectual property on the web (as long as it's not cropped out or defaced);  you can't blame a content creator for wanting to ensure their work is sourced.  And since many watermarking software apps cost a good chunk of change, it's important that people know you can watermark for free using awesome utilities like ImageMagick and ffmpeg.

Recent Features

  • By
    Introducing MooTools Templated

    One major problem with creating UI components with the MooTools JavaScript framework is that there isn't a great way of allowing customization of template and ease of node creation. As of today, there are two ways of creating: new Element Madness The first way to create UI-driven...

  • By
    Write Better JavaScript with Promises

    You've probably heard the talk around the water cooler about how promises are the future. All of the cool kids are using them, but you don't see what makes them so special. Can't you just use a callback? What's the big deal? In this article, we'll...

Incredible Demos

  • By
    Advanced CSS Printing – Using JavaScript Double-Click To Remove Unwanted DIVs

    Like any good programmer, I'm constantly searching around the internet for ideas and articles that can help me improve my code. There are thousands of talented programmers out there so I stumble upon some great articles and code snippets that I like to print out...

  • By
    MooTools History Plugin

    One of the reasons I love AJAX technology so much is because it allows us to avoid unnecessary page loads.  Why download the header, footer, and other static data multiple times if that specific data never changes?  It's a waste of time, processing, and bandwidth.  Unfortunately...

Discussion

  1. This is a great read, I always forget to do this with my photos. Thanks for explaining on how to do it the correct way!

  2. Marcin

    I think it’s better to implement watermarking in CMS itself (if you need sign pictures for blog etc.) rather than manually (even if it’s simple) sign pictures from command line. Of course for social media and similar this solution is good.

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!