Publishing for calibration process
According to the normal work flow, a set of printing plates is produced in the uncalibrated state with calibration proofs.
Record the plate curve in the uncalibrated state
Use a plate measuring instrument to measure the dot area of ​​the test plate at 5% or 10% to record the publishing status of the publishing machine. For this special printing plate and screening status, these values ​​can be used to check the publication status at any time in the future. At this stage, it is not necessary to care that the actual value of the printing plate is the same as the value in the document. This is normal.
Check the press preparation
Check that the printing press (or the equipment you are going to calibrate) and other consumables are in the required state. Consumables include the viscosity of ink, blankets, lining, pressure, fountain solution, temperature and humidity control, etc. List printing variables that are not within the scope of this article. To ensure that the printing press is in the most ideal physical and chemical state.
Warning: The G7 method will visually calibrate any stable and repeatable equipment according to the preset NPDC and gray balance, no matter what the state of the printing press is; There will be no effect, and the printing conditions will not improve. For example, printing a certain part of the color set excessively increases the dot expansion to compensate for the RIP curve, but the root cause problem cannot be solved, which may cause the image to be worse, unstable or other undesirable results.
Check measurement tools and observation status
Check that all measuring equipment has been calibrated and is in a standard state, and the light source around the press is D50. Make sure that all random and hand-held spectrophotometers and spectrodensitometers have been calibrated within the allowable range.
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