Nikon 9235 Reference Manual - Page 123

• 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 before the data are passed to the host application. Use this setting when the host application does not support independent 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 effective. 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. Reference: Preferences 122