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Preferences—Nikon Color Management
Main scan gamma
Main scan gamma options are only
visible when Nikon Scan is being
used as a TWAIN source or acquire
plug-in for another program (when
Nikon Scan is used as a “stand-
alone” application, preview gamma automatically applies
both to the preview image and to the final scan). Image data
passed to the host application are modified according to the
option chosen here. Three options are available:
Use preview gamma
The gamma value chosen for preview gamma is applied be-
fore the data are passed to the host application. Use this
setting when the host application does not support inde-
pendent gamma settings and you want the final image to be
modified for display on your monitor.
Use application gamma
In some environments, a value for gamma can be chosen
in the host application and passed to the Nikon Scan plug-
in. When Use application gamma is selected, this value is
applied to the main scan data before they are passed to the
host application.
Two conditions must be fulfilled if this option is to be effec-
tive. First, the interface between the application and Nikon
Scan must allow the gamma value to be passed to the Nikon
Scan plug-in. The TWAIN interface used under Windows
does not, however, allow the gamma value to be passed to
the TWAIN source (i.e., to Nikon Scan). Consequently, in the
Windows version of Nikon Scan a default value of 2.2 is used
for main scan gamma whenever Use application gamma
is selected. Second, the application must support gamma
transfer. If Use application gamma is selected with a
Macintosh application that does not support this feature,
Macintosh system gamma (1.8) will be used.
Use custom gamma
When this option is selected, a value for main scan gamma
can be entered in the text box.
