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2324414
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0
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7
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2010-02-24T07:51:44.060
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2013-07-08T21:14:43.937
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2013-07-08T21:14:43.937
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text
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<p>This is the code I use. It supports rotation, and also sets the image resolution to the JPEG standards of 72dpi@24-bit color (by default GDI+ saves images at 96dpi@32-bit color). It also fixes the black/gray border problem that some people experience when resizing images.</p> <pre><code>/// <summary> /// Resizes and rotates an image, keeping the original aspect ratio. Does not dispose the original /// Image instance. /// </summary> /// <param name="image">Image instance</param> /// <param name="width">desired width</param> /// <param name="height">desired height</param> /// <param name="rotateFlipType">desired RotateFlipType</param> /// <returns>new resized/rotated Image instance</returns> public static Image Resize(Image image, int width, int height, RotateFlipType rotateFlipType) { // clone the Image instance, since we don't want to resize the original Image instance var rotatedImage = image.Clone() as Image; rotatedImage.RotateFlip(rotateFlipType); var newSize = CalculateResizedDimensions(rotatedImage, width, height); var resizedImage = new Bitmap(newSize.Width, newSize.Height, PixelFormat.Format32bppArgb); resizedImage.SetResolution(72, 72); using (var graphics = Graphics.FromImage(resizedImage)) { // set parameters to create a high-quality thumbnail graphics.InterpolationMode = InterpolationMode.HighQualityBicubic; graphics.SmoothingMode = SmoothingMode.AntiAlias; graphics.CompositingQuality = CompositingQuality.HighQuality; graphics.PixelOffsetMode = PixelOffsetMode.HighQuality; // use an image attribute in order to remove the black/gray border around image after resize // (most obvious on white images), see this post for more information: // http://www.codeproject.com/KB/GDI-plus/imgresizoutperfgdiplus.aspx using (var attribute = new ImageAttributes()) { attribute.SetWrapMode(WrapMode.TileFlipXY); // draws the resized image to the bitmap graphics.DrawImage(rotatedImage, new Rectangle(new Point(0, 0), newSize), 0, 0, rotatedImage.Width, rotatedImage.Height, GraphicsUnit.Pixel, attribute); } } return resizedImage; } /// <summary> /// Calculates resized dimensions for an image, preserving the aspect ratio. /// </summary> /// <param name="image">Image instance</param> /// <param name="desiredWidth">desired width</param> /// <param name="desiredHeight">desired height</param> /// <returns>Size instance with the resized dimensions</returns> private static Size CalculateResizedDimensions(Image image, int desiredWidth, int desiredHeight) { var widthScale = (double)desiredWidth / image.Width; var heightScale = (double)desiredHeight / image.Height; // scale to whichever ratio is smaller, this works for both scaling up and scaling down var scale = widthScale < heightScale ? widthScale : heightScale; return new Size { Width = (int) (scale * image.Width), Height = (int) (scale * image.Height) }; } </code></pre>
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1. POResizing an image in asp.net without losing the image quality
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1. USDaniel T.
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1. USDaniel T.
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1. COThank you for pointing to the solution to the gray border problem.
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2. COAs above, thanks for the border problem fix.
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3. COThis solution resize without change original image colors! Great job!
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  USdanyolgiax

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