Check CMYK TVI
Check the TVI value of each CMYK color version. The difference between each TVI curve of CMY should be within 3%, and the black version is slightly higher than 3-6%. If possible, draw a TVI curve for each color, and then find a similar shape curve for each color below.
Note: TVI value is not important, what is important is that all ink curves must be smooth and smooth.
A set of typical uncalibrated better TVI curves. Note: These curves are based on CIEXYZ supreme and will be different from the TVI curve in density form.
Adjust equipment gray balance
Set the spectrophotometer to D50, 2 ° state, and then measure the gray balance value of multiple color patches (50C, 40M, 40Y). The standard gray balance (ISO standard 1 or 2 # paper) is: 50C, 40M, 40Y = a * 0.0 (± 1.0), b * -1.0 (± 2.0)
Note: The L * value is relatively unimportant at this time.
If the (50C, 40M, 40Y) gray balance patch is close to these values, adjust the CMY solid density value within the allowable tolerance range to obtain the ideal CIELab gray value. The figure below shows how to adjust the solid density of CMY ink for L * a * b * error combinations. Use this table to find the appropriate a * and b * changes in the horizontal row, and then find the appropriate L * column to find the recommended CMY change. The up and down arrows indicate its increase or decrease. No arrow means no change.
The chart shows how to adjust the amount of C, M, Y ink through lab error
If the gray balance cannot be close to the target a *, b * values, or cannot be corrected by a small amount of field density adjustment, then check whether one or more TVI values ​​are too large, whether the hue of the ink is correct, and whether the overprint is correct (may be due to the ink Poor viscosity or poor emulsification), or the ink color sequence is wrong.
If you don't want or can't adjust the gray balance on the printing press, record the difference between the actual value of a * and b * and the target value (to facilitate the inspection of the uncalibrated samples in the future), and then adjust the gray balance through the CMY three-color RIP curve.
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