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POSet watermark on an image and save it in an original quality
 

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  1. POSet watermark on an image and save it in an original quality
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    <p>I upload a photo on web site and I want to set a watermark on it and save it in original quality. For testing I create C# application.</p> <pre><code>class Class1 { public static string GetContentType(String path) { switch (Path.GetExtension(path)) { case ".bmp": return "Image/bmp"; case ".gif": return "Image/gif"; case ".jpg": return "Image/jpeg"; case ".png": return "Image/png"; default: break; } return String.Empty; } public static ImageFormat GetImageFormat(String path) { switch (Path.GetExtension(path).ToLower()) { case ".bmp": return ImageFormat.Bmp; case ".gif": return ImageFormat.Gif; case ".jpg": return ImageFormat.Jpeg; case ".png": return ImageFormat.Png; default: return null; } } public static void AddWaterMark(string sourceFile, string destinationPath) { // Normally you’d put this in a config file somewhere. string watermark = "http://mysite.com/"; Image image = Image.FromFile(sourceFile); Graphics graphic; if (image.PixelFormat != PixelFormat.Indexed &amp;&amp; image.PixelFormat != PixelFormat.Format8bppIndexed &amp;&amp; image.PixelFormat != PixelFormat.Format4bppIndexed &amp;&amp; image.PixelFormat != PixelFormat.Format1bppIndexed) { graphic = Graphics.FromImage(image); } else { Bitmap indexedImage = new Bitmap(image); graphic = Graphics.FromImage(indexedImage); // Draw the contents of the original bitmap onto the new bitmap. graphic.DrawImage(image, 0, 0, image.Width, image.Height); image = indexedImage; } graphic.SmoothingMode = SmoothingMode.AntiAlias &amp; SmoothingMode.HighQuality; Font myFont = new Font("Arial", 20); SolidBrush brush = new SolidBrush(Color.FromArgb(80, Color.White)); //This gets the size of the graphic SizeF textSize = graphic.MeasureString(watermark, myFont); // Code for writing text on the image. PointF pointF = new PointF(430, 710); graphic.DrawString(watermark, myFont, brush, pointF); image.Save(destinationPath, GetImageFormat(sourceFile)); graphic.Dispose(); } } //And using class Program { private static string file1 = "C:\\1.JPG"; private static string file1_withwatermark = "C:\\1_withwatermark.JPG"; static void Main(string[] args) { Class1.AddWaterMark(file1, file1_withwatermark); } } </code></pre> <p>The resolution of file1 is <code>3648x2736</code>, size - <code>4Mb</code>.</p> <p>The first thing I don't understand is why does the <code>file1_withwatermark</code> isn't with watermark?</p> <p>And the second one is why does the size of the <code>file1_withwatermark</code> is <code>1Mb</code>, however the resolution of it is <code>3648x2736</code> too! I want to save <code>file1_withwatermark</code> in original quality, that is the size of <code>file1_withwatermark</code> must be about <code>4Mb</code>.</p>
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