Mass replacing white (255) background to a new color using photoshop script

Hello,

I want to batch replace white backgrounds (255,255,255) to a different solid color for some product images.

I found this script that almost does what I want, I just can figure out how to make it use the Select 'Color Range' in photoshop instead of the Select 'Object'.

What settings I need in the color range setting are;

Select: Highlights

Fuzziness:0%

Range:255 

Everything else in the script seems to be okay for what I need.

TIA

Here is the scrip that I am "using".

var sourceFolder = Folder("C:\\ps\\src");

  if (sourceFolder != null)

  {

     var fileList = sourceFolder.getFiles();

//comment the above line and uncomment the following line to filter specific file types. the script will not work if you have any non-image file in the src folder so try filtering files types if the script fails.

// var fileList = sourceFolder..getFiles(/\.(jpg|tif|psd|crw|cr2|nef|dcr|dc2|raw|heic)$/i);

  }

for(var a = 0 ;a < fileList.length; a++){

app.open(fileList[a]);

// Select subject

var idautoCutout = stringIDToTypeID( "autoCutout" );

var desc01 = new ActionDescriptor();

var idsampleAllLayers = stringIDToTypeID( "sampleAllLayers" );

desc01.putBoolean( idsampleAllLayers, false );

try{

executeAction( idautoCutout, desc01, DialogModes.NO );

}

catch(err){}

// Invert the selection

app.activeDocument.selection.invert();

// Create a color to be used with the fill command

var colorRef = new SolidColor

colorRef.rgb.red = 224

colorRef.rgb.green = 222

colorRef.rgb.blue = 216

// Now apply fill to the current selection

app.activeDocument.selection.fill(colorRef)

var saveFolder = new Folder("C:\\ps\\out"); //enter path for where you want the file saved

var fileName = app.activeDocument.name.replace(/\.[^\.]+$/, ''); 

saveJPG (new File(saveFolder +'/'+ Date.now() + "_" + fileName + '.jpg'),12);

app.activeDocument.close(SaveOptions.DONOTSAVECHANGES);

//fileList[a].remove();

 }

function saveJPG(saveFile, jpegQuality) {

    saveFile = (saveFile instanceof File) ? saveFile : new File(saveFile);

    jpegQuality = jpegQuality || 12;

    var jpgSaveOptions = new JPEGSaveOptions();

    jpgSaveOptions.embedColorProfile = true;

    jpgSaveOptions.formatOptions = FormatOptions.STANDARDBASELINE;

    jpgSaveOptions.matte = MatteType.NONE;

    jpgSaveOptions.quality = jpegQuality;

    activeDocument.saveAs(saveFile, jpgSaveOptions, true, Extension.LOWERCASE);

}