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POGenerate transparent PNG c#
 

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  1. POGenerate transparent PNG c#
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    <p>I have below function to generate a sample logo. What I want to do is to return a transparent png or gif instead of white background. How can I do it?</p> <pre><code>private Bitmap CreateLogo(string subdomain) { Bitmap objBmpImage = new Bitmap(1, 1); int intWidth = 0; int intHeight = 0; Font objFont = new Font("Arial", 13, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Pixel); Graphics objGraphics = Graphics.FromImage(objBmpImage); intWidth = (int)objGraphics.MeasureString(subdomain, objFont).Width; intHeight = (int)objGraphics.MeasureString(subdomain, objFont).Height; objBmpImage = new Bitmap(objBmpImage, new Size(intWidth, intHeight)); objGraphics = Graphics.FromImage(objBmpImage); objGraphics.Clear(Color.White); objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; objGraphics.DrawString(subdomain, objFont, new SolidBrush(Color.FromArgb(102, 102, 102)), 0, 0); objGraphics.Flush(); return (objBmpImage); } </code></pre> <p>here is the end result</p> <pre><code>context.Response.ContentType = "image/png"; using (MemoryStream memStream = new MemoryStream()) { CreateLogo(_subdname).Save(memStream, ImageFormat.Png); memStream.WriteTo(context.Response.OutputStream); } </code></pre> <p>function </p> <pre><code>private Bitmap CreateLogo(string subdomain) { Bitmap objBmpImage = new Bitmap(1, 1); int intWidth = 0; int intHeight = 0; Font objFont = new Font("Arial", 13, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Pixel); Graphics objGraphics = Graphics.FromImage(objBmpImage); intWidth = (int)objGraphics.MeasureString(subdomain, objFont).Width; intHeight = (int)objGraphics.MeasureString(subdomain, objFont).Height; objBmpImage = new Bitmap(objBmpImage, new Size(intWidth, intHeight)); objGraphics = Graphics.FromImage(objBmpImage); objGraphics.Clear(Color.Transparent); objGraphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias; objGraphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias; objGraphics.DrawString(subdomain, objFont, new SolidBrush(Color.FromArgb(255, 255, 255)), 0, 0); objGraphics.Flush(); return (objBmpImage); } </code></pre>
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