Low Image quality when I want to print

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Hi I want to create an image file and print it afterward, but unfortunately when I want to print it, the quality is low, the following is part of the source code I have used.

If you have any hint including the changes in source code to solve the problem, I would appreciate your comments.

Regards

private void btnCreateImage_Click(object sender, EventArgs e)
 {
     Font font = new Font("Tahoma", 10F, FontStyle.Bold);
     Brush brush = new SolidBrush(Color.Black);
     StringFormat format = new StringFormat();
     format.Alignment = StringAlignment.Center;
     format.LineAlignment = StringAlignment.Center;

     Pen pen = new Pen(Color.Blue, 1);
     Rectangle rectangle = new Rectangle(100, 100, 200, 200);


     Bitmap image = new Bitmap(600, 850);
     Graphics graphic = Graphics.FromImage(image);

     graphic.DrawRectangle(pen, rectangle);
     graphic.DrawString(txtTest.Text, font, brush, rectangle, format);


     image.Save("EndImage.bmp");

     MessageBox.Show("EndImage.bmp generated successfully in Bin Folder");

     System.Diagnostics.Process.Start("EndImage.bmp");

     image.Dispose();
     graphic.Dispose();
 }

Posted 27-Feb-13 5:53am

albert sh

Updated 27-Feb-13 5:56am

Richard C Bishop

v2

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2 solutions

Solution 1

This is because when you create an image for screen viewing it will be either 72 or 96 dpi.
Printing a high resolution image requires at least 300 dpi.

Posted 27-Feb-13 6:30am

fjdiewornncalwe

Comments

albert sh 27-Feb-13 16:33pm

Hi Marcus,
I know the problem is because of the differentiation of their resolution, but how I can create an image file with the same quality of using e.graphics for later printing.
Thanks

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Mike Meinz · Accepted Answer · 2013-02-27T07:06:00

I think Marcus Kramer is on the right track. I experimented with setting the resolution of the new bitmap and got better results. Below is from my test program. Some of the other properties I experimented with are commented out below. You may or may not want to do further experimentation with those properties.

Font font = new Font("Tahoma", 10, FontStyle.Regular);
Brush brush = new SolidBrush(Color.Black) ;
StringFormat format = new StringFormat();
format.Alignment = StringAlignment.Center;
format.LineAlignment = StringAlignment.Center;
Pen pen = new Pen(Color.Blue,1);
Rectangle rectangle = new Rectangle(100, 100, 600, 600);
Bitmap image = new Bitmap(800, 800);
image.SetResolution(300, 300);
Graphics graphic = Graphics.FromImage(image);
//graphic.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;
graphic.DrawRectangle(pen, rectangle);
//graphic.TextRenderingHint = System.Drawing.Text.TextRenderingHint.ClearTypeGridFit;
//graphic.TextContrast = 0;
graphic.DrawString("Test", font,  brush, rectangle, format);
image.Save("EndImage.bmp");
MessageBox.Show("EndImage.bmp generated successfully in Bin Folder");
System.Diagnostics.Process.Start("EndImage.bmp");
image.Dispose();
graphic.Dispose();

Tested on Visual Studio 2012