how to combine 4 resized images each into one page A5 using vb.net

Dear Sir

I'm trying to combine 4 resized images each into one page A5 using vb.net

The code below successfully combines 4 image files into A5 but at full size. So I want to manually resize each image so that when printing, the result matches the manual resize. And one more thing, the code I posted does not change the dpi in the output; there might be something wrong with the code I posted.

Info on how to resize the image below:

Height Image : 7.3 cm

Width Image : 5.2 cm

Please Guide

Thanks

Link image file

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim imagePaths As String() = {
        folderPath + "\image1.png",
        folderPath + "\image2.png",
        folderPath + "\image3.png",
        folderPath + "\image4.png"
    }

    Dim outputPath As String = folderPath + "\merged_image.png"

    MergeImages(outputPath, imagePaths)
    MessageBox.Show("Images merged successfully!")
End Sub
Public Sub MergeImages(outputPath As String, imagePaths As String())
        ' Ensure there are exactly 4 images
        If imagePaths.Length <> 4 Then
            Throw New ArgumentException("You must provide exactly 4 image paths.")
        End If

        ' Define A5 size in pixels (at 300 DPI)
        'Dim a5Width As Integer = CInt(1748) ' 148mm at 300 DPI
        'Dim a5Height As Integer = CInt(2480) ' 210mm at 300 DPI
        Dim a5Width As Integer = CInt(5.83 * 300) ' 5.8 inches
        Dim a5Height As Integer = CInt(8.27 * 300) ' 8.3 inches

        ' Create a new bitmap for the A5 canvas
        Using canvas As New Bitmap(a5Width, a5Height)
            'set resolution
            canvas.SetResolution(300, 300)
            Using g As Graphics = Graphics.FromImage(canvas)
                ' Set background to white
                g.Clear(Color.White)

                ' Load the images
                Dim images As Image() = imagePaths.Select(Function(path) Image.FromFile(path)).ToArray()

                ' Calculate positions and sizes for the 4 images (2x2 grid)
                Dim halfWidth As Integer = a5Width \ 2
                Dim halfHeight As Integer = a5Height \ 2



                ' Draw each image in its respective quadrant
                g.DrawImage(images(0), New Rectangle(0, 0, halfWidth, halfHeight)) ' Top-left
                g.DrawImage(images(1), New Rectangle(halfWidth, 0, halfWidth, halfHeight)) ' Top-right
                g.DrawImage(images(2), New Rectangle(0, halfHeight, halfWidth, halfHeight)) ' Bottom-left
                g.DrawImage(images(3), New Rectangle(halfWidth, halfHeight, halfWidth, halfHeight)) ' Bottom-right

                ' Dispose of the images
                For Each img In images
                    img.Dispose()
                Next
            End Using

            ' Save the final merged image
            canvas.Save(outputPath, Imaging.ImageFormat.Png)
        End Using
End Sub