Determination Of Filtration - JOBO ColorLine 100 Instrucciones Para El Uso

5.

Determination of filtration

• Switch both the enlarger and the ColorLi-
ne 100 on
• Place negative in enlarger, open lens to
maximum aperture, and focus the image
on the enlarger baseboard
• Swing diffuser under lens
• Place the ColorLine 100 in the centre of
the baseboard
• Switch darkroom lights and safelight off
• Alter both the yellow and magenta filtration
on the enlarger colour head (Cyan = 0)
until both the yellow and magenta LEDs on
the ColorLine 100 are off
• Switch enlarger light off, swing diffuser
away from the lens, stop the lens down
and expose the print.
• The exposure time can be determined with
the JOBO Comparator or the JOBO Com-
time. Adjust the lens aperture if necessary
to keep the exposure time within the 2-20
second range. This will prevent colour
shifts due to slope errors.
16
Increase filter values
Reduce filter values