I have the following function in a script:

function makeSelectionFromRGB()
{
    var idsetd = charIDToTypeID( "setd" );
    var desc2237 = new ActionDescriptor();
    var idnull = charIDToTypeID( "null" );
    var ref970 = new ActionReference();
    var idChnl = charIDToTypeID( "Chnl" );
    var idfsel = charIDToTypeID( "fsel" );
    ref970.putProperty( idChnl, idfsel );
    desc2237.putReference( idnull, ref970 );
    var idT = charIDToTypeID( "T   " );
    var ref971 = new ActionReference();
    var idChnl = charIDToTypeID( "Chnl" );
    var idChnl = charIDToTypeID( "Chnl" );
    var idRGB = charIDToTypeID( "RGB " );
    ref971.putEnumerated( idChnl, idChnl, idRGB );
    desc2237.putReference( idT, ref971 );
    executeAction( idsetd, desc2237, DialogModes.NO );
}

This function makes selections on an image based on something I can't find out, and its's what I want to find out. I have tried to view the history panel, but it doesn't provide details. The history log only says that a script was run. How can I recreate this script's actions in photoshop?