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d-lab.2, d-lab.2plus, netlab.2plus: Operation
5.3.5
When Should Maximum Densities Be Changed?
An incorrect balance of maximum densities is mainly noticeable in BW pictures, in scenes
with large black areas, or in case of synthetic motifs. The following characteristics should
be optimized with the balance of the maximum densities:
a) Neutral appearance of shadows
A neutral black balance in the shadows can be obtained if the maximum densities of the
three color channels show a neutral balance in the PBL field with the highest density. This
balance depends on the paper type in use, e.g. red shadows can be corrected
by increasing the Dmax red value,
–
or, if the red channel is already at the limit of the laser intensity, by decreasing the
–
Dmax green and Dmax blue values accordingly.
b) Depth of shadows
Generally speaking: the higher the maximum densities on the PBL print the more depth in
the shadows can be obtained.
However, we do not suggest to enter maximum densities higher than 2.5, as this may
cause irregularities in the color scale around highly saturated colors especially in
synthetic motifs.
c) Neutral appearance of fringes caused by blooming effects
Fringes may appear in motifs with sharp edges and high density differences, e.g. thin
white lines of white letters on black background (black leaks into the white letters).
Especially the colored fringes look irritating. Therefore a neutral color should be adjusted
for the fringes.
Generally these fringes can be reduced by reducing the maximum density. The colored
appearance of fringes can be adjusted by variations of the respective maximum density:
Whereby a reduction
of Dmax red results in less cyan,
–
of Dmax green results in less magenta,
–
and of Dmax blue results in less yellow
–
in the fringes.
The fringes react quite critically to the changes of the Dmax value, therefore do not use
values for ∆red, ∆green, or ∆blue that are higher than 0.05.
The adjustment of neutral fringes should be made with a suitable motif, i.e. thin white
lines or print on black background or a fine black and white crosshatch pattern.
The variations of the maximum densities for the adjustment of the fringes always results
in a compromise regarding the characteristics mentioned in item a) and b).
AgfaPhoto
2005-05-01 / PN 04092_01
Tests
5
5-15
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