A gamma function of DICOMscope

[mokudo]

”Create VOI LUT with Gamma” in "Window Setting"

It is a question about the function of Java_J2 Ci_jDVPresentationState_setGammaVOILUT of a jInterface file.
How to use the function of setGammaVOILUT is not known.

I would like to read a DCM file, to set up a gamma value and to learn the method by which the reflected result is obtained.
Would the source code of a sample show?

DcmFileFormat imagefile;
imagefile.loadFile("image.dcm")；

please help me.