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    <p>This is the code that I worked out for a specific requirement ie: the destination is always in landscape ratio. It should give you a good start.</p> <pre><code>public Image ResizeImage(Image source, RectangleF destinationBounds) { RectangleF sourceBounds = new RectangleF(0.0f,0.0f,(float)source.Width, (float)source.Height); RectangleF scaleBounds = new RectangleF(); Image destinationImage = new Bitmap((int)destinationBounds.Width, (int)destinationBounds.Height); Graphics graph = Graphics.FromImage(destinationImage); graph.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic; // Fill with background color graph.FillRectangle(new SolidBrush(System.Drawing.Color.White), destinationBounds); float resizeRatio, sourceRatio; float scaleWidth, scaleHeight; sourceRatio = (float)source.Width / (float)source.Height; if (sourceRatio &gt;= 1.0f) { //landscape resizeRatio = destinationBounds.Width / sourceBounds.Width; scaleWidth = destinationBounds.Width; scaleHeight = sourceBounds.Height * resizeRatio; float trimValue = destinationBounds.Height - scaleHeight; graph.DrawImage(source, 0, (trimValue / 2), destinationBounds.Width, scaleHeight); } else { //portrait resizeRatio = destinationBounds.Height/sourceBounds.Height; scaleWidth = sourceBounds.Width * resizeRatio; scaleHeight = destinationBounds.Height; float trimValue = destinationBounds.Width - scaleWidth; graph.DrawImage(source, (trimValue / 2), 0, scaleWidth, destinationBounds.Height); } return destinationImage; } </code></pre>
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