winfrom打印的问题

Question

使用的printDocument控件，打印IC会员卡，使用的c#代码打印出来的照片清晰度非常差，而我用其他打印方式(比如：photoshop）就非常好，请问这是为什么？还有需要设置的吗？ 

this.printDocument1.DefaultPageSettings.Margins = new Margins(0, 0, 0, 0);
            this.printDocument1.DefaultPageSettings.Landscape = true;
            this.printDocument1.DefaultPageSettings.PrinterResolution.X = 600;
            this.printDocument1.DefaultPageSettings.PrinterResolution.Y = 600;
            this.printDocument1.OriginAtMargins = true;
            this.pageSetupDialog1.EnableMetric = true;
            this.pageSetupDialog1.ShowDialog();
            this.printDocument1.PrintPage += printDocument1_PrintPage;
            if (printPreviewDialog1.ShowDialog() != DialogResult.OK) return;
            this.printDocument1.Print();





        private async void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
        {
            await writeCardTask(e);
        }

        private async Task<bool> writeCardTask(PrintPageEventArgs e)
        {
            if (e == null) return false;

            //e.Graphics.DpiX

            #region 照片

            e.Graphics.DrawImage(Bitmap.FromFile(pic), 9, 70, 88, 108);
            #endregion


            return true;
        }