Registration Marks , also known as the register cross or register, is a graphic figure that can be used to monitor the accuracy of fit of the individual colours in the printing process. Usually this mark consists of a circle and a cross of thin lines, similar to a target cross. By precisely aligning the individual separations, "flashes" in the printed image can be avoided.
So that the register mark can be printed on all separations (CMYK + spot colors), it must be marked with the Registration Mark color.
Illustration: A visual representation of the positioning of Registration Marks on the printed image
Registration Mark color is a color definition that is printed 100% in each separation. Thus an area which has been marked with this color has 400% total color application with a CMYK print. With a CMYKcm-OVG print, the total ink application would already be 900%.
Technically there is a color definition for the registration mark color in PDF and PostScript called "All".
The register mark color should only be used in the graphic for coloring Registration Marks or Crop Marks.
Method for converting different color spaces from one space to another.
Please read this article for a deeper dive.
Number of identical copies of a motif or a page of a motif.
In relation to a single printed sheet, this is the number of copies to be cut from this sheet.
A RIP - Raster Image Processor is a special software or a combination of hardware and software that converts data from a page description language such as PostScript, PDF or PCL into a pixel graphic (raster graphic), which is then usually output to a printer.
A RIP essentially implements two functions:
- Rendering – conversion of vector graphics into pixel graphics (raster graphics) into a halftone image in a certain resolution
- Screening – conversion of the halftone image into a pixel image consisting only of the existing print dots
The term Raster Image Processor is only used explicitly in prepress, where this component performs other tasks in addition to the functions mentioned above:
- Color management – Calculation of colors in the output color space
- Separations – create individual color separations for the printer
- Grid – Create a pixel grid, where pixels are either distributed or arranged at an angle.
- Trapping – create additional areas to avoid speed cameras at hard color edges
Flipping Horizontally, Flipping Vertically and Rotating are technical terms for the turning/rotating possibilities of a printed sheet, regardless of whether the process is carried out with one or two Print Items.
When the sheet is rotated, the sheet moves in the direction(s) described below in the diagram.
Figure: A visual representation of the rotating process.