How to prevent my Image from scaling down? - itext

Question

I am using iText 7.2.1.
I create two images in the following code. They are two rectangles, created from PdfFormXObject. The first is 100 x 100, and the second is 1000 x 100. They have the same stroke width. I have SetAutoScale(false) for both images.
using iText.Kernel.Colors;
using iText.Kernel.Pdf;
using iText.Kernel.Pdf.Canvas;
using iText.Layout;
using iText.Kernel.Pdf.Xobject;
namespace iTextTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
var writer = new PdfWriter("test.pdf");
var pdfdoc = new PdfDocument(writer);
var doc = new Document(pdfdoc);
// 100 x 100 rectangle
var rect1 = new iText.Kernel.Geom.Rectangle(0, 0, 100, 100);
var xobj1 = new PdfFormXObject(rect1);
var canvas1 = new PdfCanvas(xobj1, pdfdoc);
canvas1.SetStrokeColor(ColorConstants.RED);
canvas1.SetLineWidth(5);
canvas1.Rectangle(rect1);
canvas1.Stroke();
var img1 = new iText.Layout.Element.Image(xobj1).SetAutoScale(false);
doc.Add(img1);
// 1000 x 100 rectangle
var rect2 = new iText.Kernel.Geom.Rectangle(0, 0, 1000, 100);
var xobj2 = new PdfFormXObject(rect2);
var canvas2 = new PdfCanvas(xobj2, pdfdoc);
canvas2.SetStrokeColor(ColorConstants.RED);
canvas2.SetLineWidth(5);
canvas2.Rectangle(rect2);
canvas2.Stroke();
var img2 = new iText.Layout.Element.Image(xobj2).SetAutoScale(false);
doc.Add(img2);
doc.Close();
pdfdoc.Close();
writer.Close();
MessageBox.Show("OK");
}
}
}
When I add them into the document, apparently, the first image is of the original size, but the second image is scaled down.
I want the images to not scale at all even there isn't enough space. How to do this?