Ghostscript rasterizer dpi always set to 120

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C#

ASP.NET5

ghostscript

I convert PDF to images and set the dpi to 300 but the vertical and horizontal resolution values always default to 120 I am using version 9.26
This is how I do it:
Is there a way to set it differently?

What I have tried:

<pre>       Image pdf2PNG = rasterizer.GetPage(xDpi,yDpi, pageNumber);

                    //save the png's
                    pdf2PNG.Save(outputPNGPath, ImageFormat.Tiff);

Also tried:

rasterizer.CustomSwitches.Add("-r300x300");