Nikon Scan 4 User Manual page 6

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 an oth er program (when

Nikon Scan is used as a "stand-

alone" application, preview gamma automatically applies

both to the preview image and to the ﬁ nal scan). Image data

passed to the host application are modiﬁ ed according to the

option chosen here. Three op tions 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 in de -

pen dent gam ma settings and you want the ﬁ nal image to be

modiﬁ ed for display on your monitor.

Preferences— Nikon Color Management

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 fulﬁ lled if this option is to be ef fec -

tive. First, the in ter face be tween the ap pli ca tion and Nikon

Scan must allow the gamma value to be passed to the Nikon

Scan plug-in. The TWAIN in ter face used under Windows

does not, however, allow the gamma value to be passed to

the TWAIN source (i.e., to Nikon Scan). Con se quent ly, in the

Windows ver sion of Nikon Scan a default val ue of 2.2 is used

for main scan gamma when ev er Use ap pli ca tion gam ma

is se lect ed. Second, the ap pli ca tion must sup port gamma

transfer. If Use ap pli ca tion gam ma is se lect ed with a

Macintosh ap pli ca tion that does not sup port this fea ture,

Macintosh system gamma (1.8) will be used.

Use custom gamma

When this option is selected, a value for main scan gam ma

can be en tered in the text box.

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