Set sheet Font size < 10 cause Picture distortion

[RyanYANG52]

First, thanks for the awesome project.
I try this code with couple different images, all the same result

          using (var p = new ExcelPackage())
            {
                var ws = p.Workbook.Worksheets.Add("1");
                ws.Cells.Style.Font.Size = 9; // set 11 or more, picture will be fine
                var pic = ws.Drawings.AddPicture("1", Image.FromFile("1.jpg"));
                pic.SetSize(50);
                p.SaveAs(new System.IO.FileInfo("1.xlsx"));
            }

ws.Cells.Style.Font.Size = 9; // set 11 or more, picture will be fine