![]() ![]() Help="path to the input directory of images")Īp.add_argument("-o", "-output", required=True,Īp.add_argument("-a", "-alpha", type=float, default=0.25, Help="path to watermark image (assumed to be transparent PNG)")Īp.add_argument("-i", "-input", required=True, # construct the argument parse and parse the argumentsĪp.add_argument("-w", "-watermark", required=True, Open up a new file, name it watermark_dataset.py, and let’s get started: # import the necessary packages Now that we understand the process of watermarking, let’s go ahead and get started. Once we actually overlay the watermark on our image, the watermark will be semi-transparent, allowing us to (partially) see the background of the original image. In this case, I’ve set the image to have a blue background so we can visualize the logo itself (obviously, you would not be able to see the white PyImageSearch logo if I placed it on a white background - hence using a blue background for this example). In the above figure, all pixels that are not part of the white “PyImageSearch” logo are fully transparent, meaning that you can “see through them” to the background of what the image is laid on top of. Values that fall between 0 and 255 have varying levels of transparency, where the smaller the alpha value, the more transparent the pixel is. 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. Several more extra options let you align the watermark horizontally, adjust its line height, make it bold and italic, and add a shadow.A few weeks ago, I wrote a blog post on creating transparent overlays with OpenCV. Additionally, you can choose the text font you like from a list of default fonts or load a unique style font from a URL. The opacity can be increased or reduced by the slider in the color palette that's attached to the color option. There are two colors you can set – the color for the text or symbols and the color for the background. Alternatively, you can align the watermark with your mouse by moving it around in the input PNG field. The position of the watermark is controlled using the coordinates x, y, and the dimensions width, and height. To create a watermark that repeats the same text multiple times and goes over the entire PNG, copy and paste the text in the options as many times as you need it to be duplicated. You can also control the transparency level of the watermark. You can customize the watermark and choose any color for it and make it any size. Marking your PNG images with a watermark before you upload them to the Internet will protect them from easily being copied and used by third parties without your approval. You can add a watermark with a caption, label, subtitles, or arbitrary text (adding your logo or signature as a watermark is coming soon). This browser-based utility allows you to watermark your PNG files. ![]()
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