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brated for any specific tone in the image rather
than the integrated diffusion technique descri-
bed here. This tone value could be a highlight,
a skin tone, a neutral grey or a particular colour
patch on a colour chart like the JOBO Color
Chart. To calibrate the ColorLine 100 for spot
reading:
•
Make a test print containing the tone as
before
•
Switch both the ColorLine100 and enlar-
ger lamp on
•
Switch off the darkroom lights and the
safelight
•
Open the enlarger lens to full aperture
•
Without using the diffuser, position the
ColorLine's sensor cell on the tone area
•
Adjust yellow and magenta calibration con-
trols with the screwdriver supplied until all
the LED indicators are off - you may need
to re-adjust each control once or twice
The ColorLine 100 is now calibrated for the spot
tone you have chosen.
If you need a little help:
When using the ColorLine 100 for spot measu-
rements, remember that you can only use the
instrument for the calibrated tone. A skin tone
calibration can only be used for measuring skin
tones, for example. Some advanced colour
printers use the film "mask" colour between fra-
mes to calibrate spot colour meters, and the
ColorLine100 can be used in this way, too. It
pays to experiment when you gain a little expe-
rience.
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