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A digital on-screen graphic, digitally originated graphic (DOG, bug, network bug, or screenbug) is a watermark-like station logo that most television broadcasters overlay over a portion of the screen area of their programs to identify the channel.
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. "Watermarking" is the process of hiding digital information in a carrier signal ; the hidden information should, [2] but does not need to, contain a ...
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.
It's easy to spruce up a page using a variety of images showing your interests, likes, dislikes, etc. and/or using such images as navigation icons. However, such use of fair use images is not permitted under copyright law in the United States, where Wikipedia hosts the vast majority of its servers.
Non-free content can be used on Wikipedia in certain cases (for example, in some situations where acquiring a freely licensed image for a particular subject is not possible), but only within the United States legal doctrine of fair use, and in accordance with Wikipedia's own non-free content criteria as set out below.
Partial transparency can also be used to make an image less prominent, such as a watermark or other logo; or to render something see-through, such as a ghostly apparition in a video game. Animating the alpha channel in an image-editing program can allow smooth transitions between different images.