Factors Affecting Printhead Color Difference-Printhead Registration /Inkjet Printing Colors Are Inaccurate? Complete Printhead Calibration Guide
Printhead Registration
As shown below, if the printed image data is arranged in a normal grid pattern:
When the two rows of nozzles in the printhead are misaligned, the following situation will occur:
When this situation occurs, the human eye will perceive the colors as lighter.
As shown below, when the printed ink droplets become larger, the normal printing effect is as follows:
When the registration is misaligned, the printing effect is as follows:
When registration is obviously misaligned, more white gaps will appear, and the colors will look lighter compared to accurate registration.
Of course, the printing data state shown above is not particularly easy to notice. However, if normal PRN data has two rows of misaligned registration, white gaps can also easily appear, making the color blocks look lighter.
Calibration Instructions
Click the [Print] button to print the calibration chart. The printed calibration chart is shown below:
Calibration Requirements
1.Each printhead’s registration calibration chart is divided into two parts. Both parts must be calibrated properly: first calibrate the left part, then calibrate the right part.
2.After calibrating the left part, the color block at position 0 should be the most uniform, as shown in the figure below (details on the next page).
3.After calibrating CH5-8 on the left side, proceed to calibrate the right side. For the right side, the 0 position must have no white gaps or overlaps on both sides, as shown in the figure below.
Calibration Steps
First, confirm the calibration chart of the first part. If the parameter at position 0 in the printed first part status chart is uneven, we need to perform registration calibration. Taking H7 as an example, the printed calibration chart is shown below:
We need to input the calibration parameters from the corresponding positions in the chart into the software, as shown below:
If the original calibration value is 1 and the calibration chart value is also 1, then the corrected calibration value is 1+1=2.
Then, click [Left Calibration] again to print the registration calibration chart to check if it is correct. If it is not correct, modify the software parameters according to the calibration values on the chart, until the calibration chart becomes normal, as shown below.
When all channels of the first part have been calibrated, proceed to calibrate the second part. If the status chart of the first part shows white gaps or overlaps at position 0, then find the position where there are no white gaps or overlaps, as shown in the figure below.
If the color block at -2 is exactly aligned without overlap or white gaps, then adjust CH2 and CH7 both to -2, as shown in the figure below:
Original calibration chart: CH2: 0, CH7: 2; calibration chart value: -2
Corrected calibration values: CH2: 0-2 = -2, CH7: 2-2 = 0
Click [Left Calibration] again to print the registration calibration chart and check if it is correct. If it is not correct, modify the software parameters according to the calibration values on the chart until the calibration chart is correct, as shown below.
