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d-lab.2, d-lab.2plus, netlab.2plus: Operation
5.3.7
Changing the Gray Balance of the Internal Densitometer
Correction factors (calibration factors) for the three color channels can be entered for the
selected paper in the Print PBL screen. Based on these values the gray balance of the
internal densitometer can be changed, e.g. to correct the color casts on the PBL print.
Application
Papers of different manufacturers may contain different color dyes. According to the
–
spectral properties of the color dyes the measuring values of the internal densitometer
must be corrected to adapt the color reproduction of the different papers.
This correction is made by means of the three calibration factors. That means, different
–
paper types usually require different calibration factors.
The PBL can be adapted to produce a neutral gray for the gray shades (e.g. especially
–
important for BW prints).
Procedure for changing the calibration factors of a paper
The adjustment of new calibration factors for a selected paper can be made with or
without an external densitometer.
Procedure without external densitometer:
1. Print a PBL without laser point on the selected paper.
2. Determine the color cast in the grayscale on the last PBL print by means of the optical
impression (PBL is in tolerance).
3. Reduce the calibration factor of the respective color. Whereby a reduction of the
calibration factor by 0.02 results in a reduction of the density by about 2% (with 0.1 by
about 10% etc.).
4. Repeat the steps 1. through 3. until the grayscale on the last PBL print comes out
neutral.
Procedure with external densitometer:
1. Print a PBL without laser point on the selected paper.
2. On the last PBL print that was developed measure the density of a grayscale field in an
external densitometer and note the measured values. We recommend to measure the
field with medium gray density, which is directly next to the field with maximum
density (second from the right; do not take the field with the maximum density!).
AgfaPhoto
2005-05-01 / PN 04092_01
Tests
5
5-19
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