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POGDI+ resizing for Pixel zoom
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  1. POGDI+ resizing for Pixel zoom
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    copied!<p>I want to resize an image with the GDI library so that when I resize it to be larger than before there is no blending. (Like when you zoom in on an image in a paint program)</p> <p>EG: If my image is 2px wide, and 2px tall<br> (white, white,<br> white, black)<br> , and I resize it to be 100% larger, it is 4px by 4px tall<br> (white, white, white, white,<br> white, white, white, white,<br> white, white, black, black,<br> white, white, black, black) </p> <p>What InterpolationMode or Smoothing mode (or other properties) of a graphics object can I use to achieve this? The combinations that I have tried so far all cause grey to appear in the test image.</p> <p>Here is the code that I'm using </p> <pre><code> /// &lt;summary&gt; /// Do the resize using GDI+ /// Credit to the original author /// http://www.bryanrobson.net/dnn/Code/Imageresizing/tabid/69/Default.aspx /// &lt;/summary&gt; /// &lt;param name="srcBitmap"&gt;The source bitmap to be resized&lt;/param&gt; /// &lt;param name="width"&gt;The target width&lt;/param&gt; /// &lt;param name="height"&gt;The target height&lt;/param&gt; /// &lt;param name="isHighQuality"&gt;Shoule the resize be done at high quality?&lt;/param&gt; /// &lt;returns&gt;The resized Bitmap&lt;/returns&gt; public static Bitmap Resize(Bitmap srcBitmap, int width, int height, bool isHighQuality) { // Create the destination Bitmap, and set its resolution Bitmap destBitmap = new Bitmap((int)Convert.ToInt32(width), (int)Convert.ToInt32(height), PixelFormat.Format24bppRgb); destBitmap.SetResolution(srcBitmap.HorizontalResolution, srcBitmap.VerticalResolution); // Create a Graphics object from the destination Bitmap, and set the quality Graphics grPhoto = Graphics.FromImage(destBitmap); if (isHighQuality) { grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality; grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic; } else { grPhoto.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.None; //? this doesn't work grPhoto.InterpolationMode = InterpolationMode.NearestNeighbor; //? this doesn't work } // Do the resize grPhoto.DrawImage(srcBitmap, new Rectangle(0, 0, width, height), new Rectangle(0, 0, srcBitmap.Width, srcBitmap.Height), GraphicsUnit.Pixel); grPhoto.Dispose(); return destBitmap; } </code></pre>
 

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