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Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
When printing at 150 lpi, traps are usually between 1/150 and 1/300 inch (0.48 pt and 0.24 pt, 0.16 mm and 0.08 mm). These values are usually multiplied by 1.5 or 2 when one of the colors is black. The trap is not visible since the lighter color is spread underneath the—almost—opaque black.
For example, a three-page work (starting on the left-hand sheet) followed immediately by a two-page work involves one page turn during each work. If a blank page immediately follows the three-page work (on the right-hand sheet), the two-page work will span the left and right pages, alleviating the need for a page turn during the second work.
In printing, registration black is a black color that includes 100% of each of the process colors used. Typically these are cyan, magenta, yellow and black , [4] but if different colors are used, registration black marks are made with all of the colorants (inks). [4] Registration black is used for printing crop marks and registration marks ...
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For color processes, an individual black and white, "screened" negative is used to represent each color in a four-colour process (Cyan, Magenta, Yellow and Black) to be printed on a printing press. A screened negative has varying sizes of dots arranged in a particular pattern to represent greater or lesser density of image.
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Many laser printers can print on both sides of the paper (duplex printing), which is not possible with continuous stationery. Standard perforations are 5/32 inch in diameter (3.96875 mm, sometimes called 4 mm) and are spaced at 1 ⁄ 2 inch (13 mm) center-to-center. Tear-off horizontal perforations at page top/bottom are exactly in-between ...