Registration black: Difference between revisions
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{{Short description|Printer's mark to verify colour registration}} |
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{{Merge to|Printing registration|discuss=Talk:Printing registration#Proposed merge of Registration black into Printing registration|date=August 2023}} |
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{{Refimprove|date=June 2016}} |
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[[Image:RegistrationMark.png|right|thumb|A registration mark showing a slight misalignment of the printing heads, resulting in subtle color hues visible around the edges of the black area (click image to zoom in).]] |
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In printing, '''registration black''' is a black color that includes 100% of each of the [[Process color|process colors]] used. Typically these are [[cyan]], [[magenta]], [[yellow]] and [[black]] ([[CMYK color model|CMYK]]),<ref name="regmarks">{{cite book | title=Intelligent Vision Systems for Industry | publisher=Springer Science & Business Media |author1=Batchelor, Bruce |author2=Whelan, Paul | year=2012 | pages=12 | isbn=9781447104315}}</ref> but if different colors are used, registration black marks are made with all of the [[colorant]]s (inks).<ref name="regmarks" /> |
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{{R from merge}} |
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Registration black is used for printing crop marks and [[Printing registration|registration marks]]. When proofs for each color are generated on separate pieces of film, use of registration black makes crop marks visible on all channels, providing a useful reference for alignment. A thin line printed in registration black can also be used to check whether the printing plates are aligned. |
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{{R to section}} |
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==PostScript== |
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The [[PostScript]] printer description languages supports registration black, starting with PostScript language level 2. This is done by referring to a [[spot color]] with the special name '''All'''. This never generates a spot plate. Instead it marks all of the plates that are there. The All color space can be used with a tint value between 0.0 (no mark) to 1.0 (full intensity). Generally, only 1.0 would be used. |
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The name "All" might not be used in the user interface of a design program, especially outside English language speaking areas. However, the spot color must have the exact name "All". As a side effect, it is impossible in PostScript to create a normal spot plate with this name. |
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==PDF== |
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The [[Portable document format]] (PDF) also includes a spot color called '''All''', with the same restrictions, starting with PDF 1.2. Note that a PDF spot color must also include a "tint transform" which translates spot values into a different [[color space]] for viewing on screen, or printing to printers without spot color support. There is no special rule for the name "All", so PDF creators must include a tint transform that converts to black in some color space, in order to maintain the same appearance as the final printed piece. |
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==See also== |
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*[[Rich black]] |
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==References== |
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{{reflist}} |
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{{DEFAULTSORT:Registration Black}} |
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[[Category:Printing terminology]] |
[[Category:Printing terminology]] |
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[[Category:Print production]] |
[[Category:Print production]] |
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Latest revision as of 20:19, 17 February 2024
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