Last week, I described how to add a dynamic watermark to your images on the JVM. I didn’t find any library, so I had to develop the feature, or, more precisely, an embryo of a feature, by myself. Depending on your tech stack, you must search for an existing library or roll up your sleeves. For example, Rust offers such an out-of-the-box library. Worse, this approach might be impossible to implement if you don’t have access to the source image.

Displaying images on your website makes for an interesting problem: on one side, you want to make them publicly available; on the other, you want to protect them against undue use. The age-long method to achieve it is watermarking: A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. It is typically used to identify ownership of the copyright of such signal.

link/dynamic-watermarking/1/[Dynamic watermarking on the JVM^]: explains how to watermark images on-the-fly inside a JVM.link/dynamic-watermarking/2/[Dynamic watermarking using imgproxy and Apache APISIX^]: describe how to leverage imgproxy and Apache APISIX to achieve the same regardless of your tech stack.