eliminateWhite.jsx

activeDocument.quickMaskMode=false;
if(!activeDocument.activeLayer.isBackgroundLayer)
activeDocument.activeLayer.blendMode = BlendMode.NORMAL;

var sourceLayer=activeDocument.activeLayer;
var rLayer=activeDocument.activeLayer.duplicate();
activeDocument.activeLayer=rLayer;

var idChnM = charIDToTypeID( "ChnM" );
    var desc3 = new ActionDescriptor();
    var idpresetKind = stringIDToTypeID( "presetKind" );
    var idpresetKindType = stringIDToTypeID( "presetKindType" );
    var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );
    desc3.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );
    var idMnch = charIDToTypeID( "Mnch" );
    desc3.putBoolean( idMnch, true );
    var idGry = charIDToTypeID( "Gry " );
        var desc4 = new ActionDescriptor();
        var idRd = charIDToTypeID( "Rd  " );
        var idPrc = charIDToTypeID( "#Prc" );
        desc4.putUnitDouble( idRd, idPrc, 100.000000 );
    var idChMx = charIDToTypeID( "ChMx" );
    desc3.putObject( idGry, idChMx, desc4 );
executeAction( idChnM, desc3, DialogModes.NO );


activeDocument.activeLayer=sourceLayer;
var gLayer=activeDocument.activeLayer.duplicate();
activeDocument.activeLayer=gLayer;

var idChnM = charIDToTypeID( "ChnM" );
    var desc29 = new ActionDescriptor();
    var idpresetKind = stringIDToTypeID( "presetKind" );
    var idpresetKindType = stringIDToTypeID( "presetKindType" );
    var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );
    desc29.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );
    var idMnch = charIDToTypeID( "Mnch" );
    desc29.putBoolean( idMnch, true );
    var idGry = charIDToTypeID( "Gry " );
        var desc30 = new ActionDescriptor();
        var idGrn = charIDToTypeID( "Grn " );
        var idPrc = charIDToTypeID( "#Prc" );
        desc30.putUnitDouble( idGrn, idPrc, 100.000000 );
    var idChMx = charIDToTypeID( "ChMx" );
    desc29.putObject( idGry, idChMx, desc30 );
executeAction( idChnM, desc29, DialogModes.NO );


activeDocument.activeLayer=sourceLayer;
var bLayer=activeDocument.activeLayer.duplicate();
activeDocument.activeLayer=bLayer;


var idChnM = charIDToTypeID( "ChnM" );
    var desc33 = new ActionDescriptor();
    var idpresetKind = stringIDToTypeID( "presetKind" );
    var idpresetKindType = stringIDToTypeID( "presetKindType" );
    var idpresetKindCustom = stringIDToTypeID( "presetKindCustom" );
    desc33.putEnumerated( idpresetKind, idpresetKindType, idpresetKindCustom );
    var idMnch = charIDToTypeID( "Mnch" );
    desc33.putBoolean( idMnch, true );
    var idGry = charIDToTypeID( "Gry " );
        var desc34 = new ActionDescriptor();
        var idBl = charIDToTypeID( "Bl  " );
        var idPrc = charIDToTypeID( "#Prc" );
        desc34.putUnitDouble( idBl, idPrc, 100.000000 );
    var idChMx = charIDToTypeID( "ChMx" );
    desc33.putObject( idGry, idChMx, desc34 );
executeAction( idChnM, desc33, DialogModes.NO );


rLayer.blendMode = BlendMode.DARKEN;
gLayer.blendMode = BlendMode.DARKEN;
activeDocument.activeLayer=rLayer;
activeDocument.activeLayer=activeDocument.activeLayer.merge();
maskLayer=activeDocument.activeLayer.merge();



activeDocument.activeLayer=maskLayer;

activeDocument.selection.selectAll();
activeDocument.selection.copy();

maskLayer.remove();


activeDocument.activeLayer=sourceLayer;
var resultLayer=activeDocument.activeLayer.duplicate();
activeDocument.activeLayer=resultLayer;


activeDocument.quickMaskMode=true;
activeDocument.selection.selectAll();
activeDocument.paste(true);
activeDocument.quickMaskMode=false;
activeDocument.selection.clear();
activeDocument.selection.deselect();

// =======================================================
var idRmvW = charIDToTypeID( "RmvW" );
executeAction( idRmvW, undefined, DialogModes.NO );


activeDocument.activeLayer=sourceLayer;
var whiteLayer=activeDocument.activeLayer.duplicate();
activeDocument.activeLayer=whiteLayer;


activeDocument.selection.selectAll();
RGBColor = new SolidColor();
RGBColor.red = 255;
RGBColor.green = 255;
RGBColor.blue = 255;
activeDocument.selection.fill(RGBColor,ColorBlendMode.NORMAL, 100, false);


activeDocument.selection.deselect();


activeDocument.activeLayer=resultLayer;