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C# DrawString Quality

Posted on 2006-07-24
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Last Modified: 2007-12-19
Hi,

When you use DrawString, say for Arial Black White on a RGB background. The quality of the color and the text is awful.  Does anyone know how I can get a crisp clean finish to the text and the background color?

thanks in advance

Andrew
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Question by:REA_ANDREW
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9 Comments
 
LVL 25

Expert Comment

by:InteractiveMind
ID: 17167044
By awful, do you mean jagged (aliased) ?

If so, then you could try apply the following to your Graphics instance prior to drawing the string:

   myGraphicsInstance.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

In order to antialias the graphics.

Hopefully that will work for fonts as well.
If not however, then perhaps draw the text to your own Graphics instance, and run your own antialiasing algorithm to smooth it.
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Author Comment

by:REA_ANDREW
ID: 17167062
when I say awful I mean like if I put a white font on a blue background I get tons of multicolored fine noise around the text and it looks like really low quality Gif. what would cause this?
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Expert Comment

by:InteractiveMind
ID: 17167069
Oh.
hmm

Are you able to screenshot it, and upload it for us to see?
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LVL 20

Author Comment

by:REA_ANDREW
ID: 17167085
thankyou, an example can be found here

http://www.nwcms.co.uk/andy/crossdesign/stories/ImageTitle.aspx?sid=1

See the noise?
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Expert Comment

by:InteractiveMind
ID: 17167109
mhmm, I see it.

Could you post the extract of code you're using to produce that text please?
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Author Comment

by:REA_ANDREW
ID: 17167185
Certainly, thank you for your time

protected void Page_Load(object sender, EventArgs e)
    {
        if (Request.QueryString["sid"] != null)
        {
            Response.Clear();
            Response.ContentType = "image/jpeg";
            System.Drawing.Image NewOne = GenerateImage(Convert.ToInt32(Request.QueryString["sid"]));
            NewOne.Save(Response.OutputStream, ImageFormat.Jpeg);
        }
    }
    private System.Drawing.Image GenerateImage(int SID)
    {
        string StrSql = "SELECT story_title FROM story_view WHERE story_id =" + SID;
        SqlDataAdapter StoryAdp = new SqlDataAdapter(StrSql, MConn);
        DataSet StoryDs = new DataSet();
        StoryAdp.Fill(StoryDs);
        DataRow NewRow = StoryDs.Tables[0].Rows[0];
        string Title = NewRow[0].ToString();
        Bitmap b = new Bitmap(Server.MapPath("../layout_images/bar.jpg"));
        Graphics g = Graphics.FromImage(b);
        SizeF TextWidth = g.MeasureString(Title, new Font("Arial Black", 14));
        //g.Clear(Color.FromArgb(116, 147, 235));
        SolidBrush Solid3 = new SolidBrush(Color.White);
        g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
        g.DrawString(Title, new Font("Arial Black", 14, FontStyle.Regular), Solid3, new Rectangle(0, 5, 444, 35));
        g.Dispose();
        return b;
    }
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LVL 25

Expert Comment

by:InteractiveMind
ID: 17167310
Do you get the noise if you write the response as a format other than JPEG?
Such as image/gif.
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Author Comment

by:REA_ANDREW
ID: 17167404
how do you set the quality of the Gif format?
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