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A digital watermark is called imperceptible if the original cover signal and the marked signal are perceptually indistinguishable. A digital watermark is called perceptible if its presence in the marked signal is noticeable (e.g. digital on-screen graphics like a network logo, content bug, codes, opaque images). On videos and images, some are ...
If the data file to be retrieved is an image, the provider can embed a watermark for protection purposes. The process allows tolerance to some change, while still maintaining an association with the original image file. Researchers have also developed techniques that embed components of the image within the image.
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.
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Camera Image File Format; Camera module; List of cameras supporting a raw format; Channel (digital image) Chimping; Color filter array; Colour co-site sampling; CombineZ; Computational photography; Curve (tonality)
Illustration workshop : For improvement of non-photographical images such as graphics, diagrams, etc. Photography workshop : For improvement of photography-related imagery including macro, digital, and monochrome photography. Map workshop : For improvement of maps and cartography.
A number of authentication systems are known by the general term of "watermarking" methods, since they rely on embedding authentication information into another information bearer, by analogy with the watermarking of paper.
Colour fringes that worsen the further the image point is from the optical axis. [7] [12] TIFF: Tag Image File Format. A high fidelity computer file format for handling digital images that does not sacrifice colour and form detail in the way that 'lossy' compression formats such as GIF, JPEG and PNG do. [8] TLR: Twin-lens reflex. A camera with ...