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2. Watermark - Wikipedia

   en.wikipedia.org/wiki/Watermark

   Watermark. 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 ...

3. Pixabay - Wikipedia

   en.wikipedia.org/wiki/Pixabay

   Pixabay.com is a free stock photography and royalty-free stock media website. It is used for sharing photos, illustrations, vector graphics, film footage, stock music and sound effects, exclusively under the custom Pixabay license, which generally allows the free use of the material with some restrictions. [ 1][ 2][ 3] You can use the site's ...

4. Steganography - Wikipedia

   en.wikipedia.org/wiki/Steganography

   In such a case, the technique of hiding the message (here, the watermark) must be robust to prevent tampering. However, digital watermarking sometimes requires a brittle watermark, which can be modified easily, to check whether the image has been tampered with. That is the key difference between steganography and digital watermarking.

5. Personalize your background image, sounds, and toolbar ...

   help.aol.com/articles/personalize-your...

   Access your settings to see several options that let you make it your own, such as updating the sounds that you hear, adjusting the colors used, and choosing from any of your own images or the vast Flickr library to personalize your background. Change your background image

6. Wikipedia:Image use policy - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Image_use_policy

   Free images should not be watermarked, distorted, have any credits or titles in the image itself or anything else that would hamper their free use, unless, of course, the image is intended to demonstrate watermarking, distortion, titles, etc. and is used in the related article. Exceptions may be made for historic images when the credit or title ...

7. Image editing - Wikipedia

   en.wikipedia.org/wiki/Image_editing

   Basics of image editing. Raster images are stored in a computer in the form of a grid of picture elements, or pixels. These pixels contain the image's color and brightness information. Image editors can change the pixels to enhance the image in many ways. The pixels can be changed as a group, or individually, by the sophisticated algorithms ...