A Filename renaming is not similar to a conversion
So from API base we can construct:
System.Drawing.Image.FromFile("C:\_demo\image\PNG_Demo.png").Save("C:\_demo\image\Converted_Demo.tiff", System.Drawing.Imaging.ImageFormat.Tiff)
And port it to Invoke method as .Save method is a subroutine
Imports:
Invoke Method: