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A digital watermark is a kind of marker covertly embedded in a noise-tolerant signal such as audio, video or image data. [1] It is typically used to identify ownership of the copyright of such a signal.
A watermark is an identifying image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper. [1]
Historical images in the public domain sometimes are out of focus, display dye dropouts, dust or scratches or evidence of the printing process used. All photo credits should be in a summary on the image description page. Images with watermarks may be tagged {{imagewatermark}}.
To upload images to Commons you can use the Commons Upload Wizard tool, which will guide you through the process. There is an important caveat: Commons accepts only freely licensed images . This means that you cannot upload most images found on the internet, as the vast majority of them are not free.
In an effort to help prevent the spread of misinformation, Google on Tuesday unveiled an invisible, permanent watermark on images that will identify them as computer-generated.
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...