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Another type of watermark is called the cylinder mould watermark. It is a shaded watermark first used in 1848 that incorporates tonal depth and creates a greyscale image. Instead of using a wire covering for the dandy roll, the shaded watermark is created by areas of relief on the roll's own surface.
A digital watermark is called imperceptible if the watermarked content is perceptually equivalent to the original, unwatermarked content. [7] In general, it is easy to create either robust watermarks or imperceptible watermarks, but the creation of both robust and imperceptible watermarks has proven to be quite challenging. [2]
If you're not sure that your file is freely licensed, please only upload it if you took the photo yourself. After the image is uploaded, click the "Use this file" button at the top of the image page (with the W) and copy the "thumbnail" code.
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}}.
Caution: Before removing a watermark from a copyrighted image, please read the WMF's analysis of the legal ramifications of doing so. Requesting work .
If the image you wish to upload is not under a free license, but meets all of Wikipedia's fair use criteria, then you are permitted to upload it directly into the English Wikipedia with a fair use rationale.