![]() Values in our alpha channel can range, where a value of 255 is 100% opaque (i.e., not transparent at all) while a value of 0 is 100% transparent. This watermark is a PNG image with four channels: a Red channel, a Green channel, a Blue channel, and an Alpha channel used to control the transparency of each of the pixels in the image. To get started, we’ll need a watermark, which for the purposes of this tutorial, I’ve chosen to be the PyImageSearch logo: Figure 1: Our example watermark image - the PyImageSearch logo. The goal of this blog post is to demonstrate how to add watermarks to images using OpenCV and Python. Looking for the source code to this post? Jump Right To The Downloads Section Watermarking images with OpenCV and Python ![]() To learn how to utilize OpenCV to watermark your own dataset of images, keep reading. In both of these cases, the goal of watermarking is to create a unique and identifiable pattern on the image, giving attribution to the original creator, but without destroying the contents of the image itself. We also see digital watermarks in copyrighted video - in this case, a watermark is embedded into each frame of the video, thereby crediting the original producer of the work. This allows the photographer to distribute demos and samples of their work, without actually “giving away” the original compositions. Watermarking an image or video is called digital watermarking, and is the process of embedding a unique and identifying pattern onto the image itself.įor example, professional photographers tend to watermark digital proofs sent to clients (including relevant information such as their name and/or design studio) until the client agrees to purchase the photos, at which the original, unaltered images are released. This post was meant to be a gentle introduction to a neat little trick you can use to improve the aesthetics of your processed image(s), such as creating a Heads-up Display (HUD) on live video streams.īut there’s another, more practical reason that I wanted to introduce transparent overlays to you - watermarking images. A few weeks ago, I wrote a blog post on creating transparent overlays with OpenCV.
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