Invisible image watermarking adds another layer of protection for your private content. Image watermarks can be used to secure your image assets alongside text assets. When image watermarking is enabled, images that are embedded within PDFs will automatically receive individualized watermarks (support for standalone images is coming soon).
Enabling Image watermarking
Default image watermarking options for your entire organization can be accessed in the Marking tab of the EchoMark app. You can adjust image watermarking on a per-file basis by opening the file and then choosing (...) > Mark options from the menu in the upper-right.
Watermark types
EchoMark currently supports two types of invisible image watermark. Each comes with advantages and disadvantages that should be weighed against the needs of your organization and particular use case.
Luma
Our most robust image watermark is a good general purpose watermark for scans, text-heavy content, tables, and photographs. It is robust to leaks via printout or low quality photo. This mark works by applying subtle dilations to various parts of the image, meaning that it can sometimes become noticeable, especially if your image contains repeating geometric patterns or strong diagonal lines.
Chroma
Our most imperceptible watermark is best for full-color imagery. It can protect colorful photography and artwork without introducing any noticeable changes for viewers. It works well for protecting against leaks via screenshot or high-quality photo, but this method is not robust for leaks via printout or low-quality photo. Since it works by subtly altering color tones in your image, it offers no protection for black-and-white imagery or for very geometric images (e.g. scanned documents with rasterized text, tables, etc.).