Contiguous selection by color

ok...Here is another way, but for this you have to enter the x:y coordinates, but I would not know how to get only the pixels that contain the white color

var xP = 400;//example

var yP = 700;//example

function MagicWand(x,y) {

var idsetd = charIDToTypeID( "setd" );

    var desc425 = new ActionDescriptor();

    var idnull = charIDToTypeID( "null" );

        var ref134 = new ActionReference();

        var idChnl = charIDToTypeID( "Chnl" );

        var idfsel = charIDToTypeID( "fsel" );

        ref134.putProperty( idChnl, idfsel );

    desc425.putReference( idnull, ref134 );

    var idT = charIDToTypeID( "T   " );

        var desc426 = new ActionDescriptor();

        var idHrzn = charIDToTypeID( "Hrzn" );

        var idPxl = charIDToTypeID( "#Pxl" );

        desc426.putUnitDouble( idHrzn, idPxl, xP );  //pixel position

        var idVrtc = charIDToTypeID( "Vrtc" );

        var idPxl = charIDToTypeID( "#Pxl" );

        desc426.putUnitDouble( idVrtc, idPxl, yP ); //pixel position

    var idPnt = charIDToTypeID( "Pnt " );

    desc425.putObject( idT, idPnt, desc426 );

    var idTlrn = charIDToTypeID( "Tlrn" );

    desc425.putInteger( idTlrn, 1 );

    var idAntA = charIDToTypeID( "AntA" );

    desc425.putBoolean( idAntA, true );

executeAction( idsetd, desc425, DialogModes.NO );

}

MagicWand()

ok, this is the script code by "dominique filiol"
https://forums.adobe.com/message/8513288#8513288

This code selects everything with a specific color, but I only want one.

"

//RechercheBlanc.jsx

//RechercheBlanc.jsx

//Recherche une couleur

var chercheCouleur = new SolidColor();

chercheCouleur.rgb.red=255;

chercheCouleur.rgb.green=255;

chercheCouleur.rgb.blue=255;

selectColorRange(chercheCouleur);

function selectColorRange(scObj)

{

    var desc = new ActionDescriptor();

    desc.putInteger( charIDToTypeID( "Fzns" ), 0 );

    var cDesc = new ActionDescriptor();

    cDesc.putDouble( charIDToTypeID( "Rd  " ), scObj.rgb.red);

    cDesc.putDouble( charIDToTypeID( "Grn " ), scObj.rgb.green);

    cDesc.putDouble( charIDToTypeID( "Bl  " ), scObj.rgb.blue );

    desc.putObject( charIDToTypeID( "Mnm " ), charIDToTypeID( "RGBC" ), cDesc );

    desc.putObject( charIDToTypeID( "Mxm " ), charIDToTypeID( "RGBC" ), cDesc );

    executeAction( charIDToTypeID( "ClrR" ), desc, DialogModes.NO );

}

"