Transparency/opacity not working RSS

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  Trolderik

  Member

  645 Points

  355 Posts

  Transparency/opacity not working

  Dec 19, 2011 07:56 AM|LINK

  Hi,

  I'm trying to write a peace of code, that takes an inputstream from a fileuploader, resize the image and then drawing some transparent text onto it. The problem is, the text goes grey instead of opaque/transparent and i've got no clue what i'm doing wrong... I've tried with MakeTransparent and Clear(Color.Transparent), but no luck. Please help me?

  Image img = Image.FromStream(hpf.InputStream);
                  int height = Convert.ToInt32(Math.Round(((double)900 / img.Width) * img.Height));
                  Bitmap bmp = new Bitmap(900, height);
                  Graphics gr = Graphics.FromImage(bmp);
  
                  gr.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias;
                  gr.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic;
                  gr.CompositingQuality = Drawing2D.CompositingQuality.HighQuality;
                  gr.DrawImage(img, 0, 0, 900, height);
  
                  Font font = new Font("Segoe UI", 90);
                  Brush brush = new SolidBrush(Color.FromArgb(96, 255, 255, 255));
                  gr.DrawString("©", font, brush, new Point(90,90));
  
                  bmp.Save(di.FullName + "/" + newfilename, Imaging.ImageFormat.Jpeg);
                  bmp.Dispose();
                  gr.Dispose();
                  img.Dispose();
                  GC.Collect();

  Please remember to post your code.
  If this post answered your question or solved your problem, please Mark it as Answer.
  • Moved by XIII on Dec 19, 2011 09:41 AM
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  vytautas.ziu...

  Contributor

  3854 Points

  691 Posts

  Re: Transparency/opacity not working

  Dec 19, 2011 08:00 AM|LINK

  You can find example here:

  http://forums.aurigma.com/yaf_postst159_Writing-SemiTransparent-Text-in-C.aspx

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  Trolderik

  Member

  645 Points

  355 Posts

  Re: Transparency/opacity not working

  Dec 19, 2011 08:29 AM|LINK

  You don't have an example without external classes?

  Please remember to post your code.
  If this post answered your question or solved your problem, please Mark it as Answer.
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  vytautas.ziu...

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  691 Posts

  Re: Transparency/opacity not working

  Dec 19, 2011 08:58 AM|LINK

  Sure, there's one:

  http://www.dreamincode.net/forums/topic/53101-image-manipulation-with-gdi-in-c%23/

  (see the part starting with "Now for writing the semi-transparent watermark").

  • Marked as answer by Trolderik on Dec 19, 2011 09:14 AM
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  Trolderik

  Member

  645 Points

  355 Posts

  Re: Transparency/opacity not working

  Dec 19, 2011 09:14 AM|LINK

  When i removed these 2 lines, it worked

  gr.SmoothingMode = Drawing2D.SmoothingMode.AntiAlias;
  gr.InterpolationMode = Drawing2D.InterpolationMode.HighQualityBicubic;

  Please remember to post your code.
  If this post answered your question or solved your problem, please Mark it as Answer.
  • Marked as answer by Trolderik on Dec 19, 2011 09:14 AM