PDF import in photoshop

Hi All,

I am using the below code for import the PDF into Photoshop. It is working fine with 72 resolution and produce the correct output. But if we fix for 400 resolution, script produce the wrong output (image stretched vertically).
Please do the needful to get correct output and 400 resolution.
Thanks!

var inputFiles = File.openDialog("Choose the Input PDF File", "*.pdf", false);
var pdfOption = new PDFOpenOptions();
pdfOption.cropPage = CropToType.TRIMBOX;
pdfOption.antiAlias = true;
pdfOption.constrainProportions = true;
pdfOption.resolution = 400;
pdfOption.mode = OpenDocumentMode.RGB;
pdfOption.bitsPerChannel = BitsPerChannelType.EIGHT;
pdfOption.suppressWarnings = true;
app.open(inputFiles, pdfOption, false);