AGFA d-lab.3 Digital Compact Lab

Repair
Scanner
Amplifiers, functions:
− Setting the optimum amplification for the check of
the photodiodes. For optimum utilisation of the
modulation of the AD converter, the amplification
factor for the current / voltage conversion can be
modified.
− Converting the current of the photodiodes into a
voltage.
Only the current of a photodiode is proportional
to the infalling light. For this reason, the light
must be measured here. The AD converter
switched behind can only measure voltages.
The amplification of the current/voltage converter is
adjustable by the film drive processor.
Functions:
− The Prescanner is used to analyse the frames
prior to the actual exposure and main scan
procedure in the d-lab.3:
For the Prescan, the Prescanner is moved into
the light path and the film is passed over the
Prescanner. For single frames, the Prescanner is
put under the stationary frame. The film is
digitised at low resolution while the colour and
density values of the entire film including the
border are collected.
− The digitised data is transmitted to the FL
Controller where the required integration times
are found for each colour depending on:
− the density of the individual frame
− the colour corrections as a function of the film
mask
− the colour corrections as a function of a
general colour cast on the film, e.g. on
artificial light shots
− Reading the DX code
− Detecting the image boundaries for the
subsequent image positioning
− Exact image positioning during the film transport
AGFA d-lab.3 2001-01-02 /PN 9009 4.3.15