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Grain Equalization and Management (GEM)
Digital GEM, a tool for digitally reducing the effects of film grain,
is built in to 4000 ED and COOLSCAN IV ED film scanners. To
use Digital GEM, turn the Enable Post Processing check-box
on and then select the amount of correction to be performed
using the Digital GEM slider or by entering a value in the text
box to its right. The default setting is "3"; move the slider to the
right to increase the effect of Digital GEM, or to the left to
decrease its effect. Choose "0" to turn Digital GEM off. To view
the results in the Natural tab prior to scanning, click the Re-
draw button.
Reference: The Tool Chest
Digital ROC and Digital GEM
The current status of the Digital ROC and Digital GEM check-
boxes is shown in the information display in the scan window. If
changes are made to these settings without redrawing the pre-
view image, a warning icon will appear in the information dis-
play.
Digital ROC and Digital GEM
Because of the complexity of the processing involved, Digital
ROC and Digital GEM require a substantial amount of time to
perform. To speed scanning, you can disable these features be-
fore making a scan by turning Enable Post Processing off.
You can also save time by making a scan without first clicking
Redraw to preview the effects of Digital ROC and Digital GEM.
Note that if the color model is not set to grayscale, using Digital
ROC with monochrome film may introduce colors into the im-
age.
We recommend that you increase the amount of memory avail-
able to Nikon Scan or the host application to at least 128 MB
when using Digital ROC or Digital GEM on a Macintosh.
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