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POPlace watermark image on other images (C#, ASP.Net)
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  1. POPlace watermark image on other images (C#, ASP.Net)
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    copied!<p>How do I add a watermark image onto other images?</p> <p>I'm able to place text on an image as a water mark but now I have an image that I'd like to put on there instead of the text. How do I do this in C#?</p> <p>Just one more time to be specific, I have image X and I want to use it as a watermark symbol. I want this symbol to appear on all my image when shown on my website. So I will have image X watermarked on image Y and Z.</p> <p>Here's the code I currently have that creates the watermark:</p> <pre><code>public static void AddWaterMark(MemoryStream ms, string watermarkText, MemoryStream outputStream) { System.Drawing.Image img = System.Drawing.Image.FromStream(ms); Graphics gr = Graphics.FromImage(img); Font font = new Font("Tahoma", (float)40); Color color = Color.FromArgb(50, 241, 235, 105); double tangent = (double)img.Height / (double)img.Width; double angle = Math.Atan(tangent) * (180 / Math.PI); double halfHypotenuse = Math.Sqrt((img.Height * img.Height) + (img.Width * img.Width)) / 2; double sin, cos, opp1, adj1, opp2, adj2; for (int i = 100; i &gt; 0; i--) { font = new Font("Tahoma", i, FontStyle.Bold); SizeF sizef = gr.MeasureString(watermarkText, font, int.MaxValue); sin = Math.Sin(angle * (Math.PI / 180)); cos = Math.Cos(angle * (Math.PI / 180)); opp1 = sin * sizef.Width; adj1 = cos * sizef.Height; opp2 = sin * sizef.Height; adj2 = cos * sizef.Width; if (opp1 + adj1 &lt; img.Height &amp;&amp; opp2 + adj2 &lt; img.Width) break; // } StringFormat stringFormat = new StringFormat(); stringFormat.Alignment = StringAlignment.Center; stringFormat.LineAlignment = StringAlignment.Center; gr.SmoothingMode = SmoothingMode.AntiAlias; gr.RotateTransform((float)angle); gr.DrawString(watermarkText, font, new SolidBrush(color), new Point((int)halfHypotenuse, 0), stringFormat); img.Save(outputStream, ImageFormat.Jpeg); } </code></pre>
 

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