AGFA d-lab.3 Digital Compact Lab

Printer
Repair
17. Calculation
The noise correction values for green and blue
and the value of the red correction are
calculated with the facet correction values
separately for each colour. As these are small
percentage values, the errors are simply added.
The result is one Byte for each colour that is
limited to FFh in the addition with carryover. In
the mode „Noise correction off“ a fixed value
corresponding to an error of 0 % is added with
the facet correction values instead of the noise
data and red correction. The 8-bit correction
values are used along with the 10-bit pixel data
to form an 18-bit address for each colour for the
following LUTs.
18. Version
Here, a rereadable version number of the FPGA
program is stored.
19. Red laser
There are two different trigger circuits for the
red laser diode at present:
- Only dynamic triggering
- Dynamic and static triggering (Default)
The appropriate triggering can be selected by
the Software. The required control signals for
the red laser are generated.
Look Up Table (LUT)
In the LUTs the density-proportional image data is
adjusted to the output medium while the
characteristics of the lasers and the transfer
characteristics of the actuators are taken into
account. The Printer Mainboard holds two SRAM
banks 256k x 16 for each colour.
It is possible to save LUT data for two paper types
at the same time. The density-proportional pixel
data coming from the FPGA and carrying a
correction value form an 18-bit LUT-address for
each colour. The addressed memory cell holds the
12-bit wide result from the transformation of the
density-proportional pixel data with the paper
characteristic (conversion into performanceproportional
data), the following multiplication with
the reciprocal correction data and subsequent
transformation of the AOM characteristic.
6.3.22 2001-01-02 /PN 9009 AGFA d-lab.3