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Digital watermarking. 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. Digital watermarking is the process of hiding digital information in a carrier signal; the hidden information should, [2 ...
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] Watermarks have been used on postage stamps, currency, and other government ...
Uploading images to Wikipedia is a matter of: clearly establishing that the copyright status of each intended upload is appropriate for a free-content encyclopedia; and then. uploading the image with clear labeling as to its origin and copyright status. If you want to upload multiple images using the New wizard, use Commons:Special:UploadWizard.
Images for cleanup : Images needing cleanup to improve quality standards. Image captions for cleanup: Image captions needing cleanup to comply with Wikipedia guidelines. Images that should be in SVG format : Images needing conversion to SVG. SVGs for cleanup : SVGs already vectored, but require modifications to meet quality standards.
Avoid images that mix photographic and iconic content. Though CSS makes it easy to use a PNG overlay on top of a JPEG image, the Wikipedia software does not allow such a technique. Thus, both parts must be in the same file, and either the quality of one part will suffer, or the file size will be unnecessarily large.
A light-and-shade watermark, [note 1] is a watermark image produced in a chiaroscuro style. In a traditional watermark, an image is produced in paper fibers by contrasting shades of light and dark in places where the paper is made thinner or thicker during the printing process. The resulting image has a high-contrast "black and white" quality ...
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