How to determine if the four colors in a printed sheet meet the standards?


 A spectrophotometer (such as X-Rite 528/530, i1Pro, etc.) is required, and the printed sample must have solid CMYK color patches (100% dot coverage).


Measurement Steps:

1. Turn on the instrument and select T state/ISO standard.


2. Calibrate the white patch.


3. Measure the C, M, Y, and K solid color patches respectively.


4. Read the four values: C, M, Y, and K solid density.


Determining if it meets the standards (commonly used for offset coated paper):


1. Cyan (C): 1.35 ~ 1.50


2. Magenta (M): 1.30 ~ 1.45


3. Yellow (Y): 0.95 ~ 1.10


4. Black (K): 1.50 ~ 1.70


As long as it is within the range, the ink volume is qualified;


When the values ​​are too low, the ink is insufficient, the color is light, and it appears grayish. When the value is too high, it results in excessive ink, ink smearing, slow drying, and poor overprinting.


For batch consistency, the density difference of the same color in different locations should be ≤ ±0.05. Exceeding this range indicates unstable ink volume and substandard printing.

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