To measure the misregistration, you must place special marks on the press sheet. Basically, there are three marks you can use. They differ with regard to the measuring method and the equipment required.
This 8-color mark makes automatic measurement with a USB microscope camera possible. The mark has the most options, especially when measuring spot colors.
Properties of the mark
•Width: 6.4 mm
•As many as eight different colors can be placed. All the places do not have to be filled. For example, you can also use a mark only for three colors.
•The reference color has two dots as a base. The distortion of the other colors is measured against this.
•You can use the dots either with a combination of process colors and spot colors or also solely for spot colors.
This mark makes automatic measurement with an iPhone/iPad camera or USB microscope camera possible.
Properties of the mark
•Width: 6 mm
•You can measure solely the four process colors (BCMY).
With this mark, you can measure misregistration manually (visually). This measuring method takes more time and has a higher error rate than the first method. However, you need no additional equipment (a magnifier or a reflective microscope might be convenient).
The mark is for 4, 6, 8, and 10 colors, each of them in a horizontal and a vertical variant. To create characteristic curves, you need the 4-color marks.
Like other measurement marks, all the marks are located in the Dipco package of the color control bars. You can download this package from the Heidelberg web site.