Print High Resolution Image in C#

问题

I am printing image 2349 x 3600 pixels. I have resized image but printing is blurred not clean. Please looke at code -

public Bitmap resizeimage(Bitmap bitmap)
{
    Bitmap result = new Bitmap(850, 1101);
    using (Graphics grap = Graphics.FromImage(result))
    {            
        grap.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        grap.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.Bicubic;
        grap.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        grap.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;

        grap.DrawImage(bitmap, 0, 0, 850, 1101);
    }
    return result;
}

I tried everything from changing bitmap size, quality of graphics but still image blurred. I used microsoft office 2007 and resized image and printed it , it was so clear. How I can get exact printing quality as I got in microsoft office 2007. Please help.

Here is code before drawing - PrintPreviewDialog printpreview = new PrintPreviewDialog();

         //   PrintPreviewControl printpreviewc = new PrintPreviewControl();
            PrintDocument printdocument = new PrintDocument();

            printdocument.PrinterSettings.PrinterName = "EPSON L100 Series";
            int horizantal_dpi = printdocument.PrinterSettings.DefaultPageSettings.PrinterResolution.X;
            int vertical_dpi = printdocument.PrinterSettings.DefaultPageSettings.PrinterResolution.Y;
            decimal final_width_dpi = (((int)printdocument.DefaultPageSettings.PrintableArea.Width * horizantal_dpi) / 100);
            decimal final_height_dpi = (((int)printdocument.DefaultPageSettings.PrintableArea.Height * vertical_dpi) / 100);

          printimagaprint = new Bitmap((int)final_width_dpi, (int)final_height_dpi);

            //set resoultion
            printimagaprint.SetResolution(horizantal_dpi, vertical_dpi);

            Graphics g = System.Drawing.Graphics.FromImage(printimagaprint);
            g.DrawImage(bitmap, 0, 0, printimagaprint.Width, printimagaprint.Height);


            printdocument.PrintPage+=new PrintPageEventHandler(printdocument_PrintPage);
          //  printdocument.Print();
            printdocument.DocumentName = textBox1.Text;
            printpreview.Document = printdocument;
            printpreview.ShowDialog();

回答1:

Try matching the printer resolution before printing.

printDialog.PrinterSettings.PrinterName = GetTargetPrinter(); 

int horizontal_dpi = printDialog.PrinterSettings.DefaultPageSettings.PrinterResolution.X;
int vertical_dpi = printDialog.PrinterSettings.DefaultPageSettings.PrinterResolution.Y;
Decimal final_width_dpi = (((int)printDialog.PrinterSettings.DefaultPageSettings.PrintableArea.Width * horizontal_dpi) / 100); 
Decimal final_height_dpi = (((int)printDialog.PrinterSettings.DefaultPageSettings.PrintableArea.Height * vertical_dpi) / 100);

printImage = new Bitmap((int)final_width_dpi, (int)final_height_dpi);

// Set Resolution
printImage.SetResolution(horizontal_dpi, vertical_dpi);

Graphics g = System.Drawing.Graphics.FromImage(printImage);

And please try to provide more descriptive code. I am just making assumption for now.

来源：https://stackoverflow.com/questions/22400056/print-high-resolution-image-in-c-sharp

标签

image-processing