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POGenerating image thumbnails in ASP.NET?
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5882307
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7
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CreationDate
2011-05-04T10:55:58.040
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2011-05-05T11:36:08.027
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2017-05-23T12:22:26.013
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text
Body
What is the fastest and more reliable way of generating thumbnails in .NET? I need to get any image, compress it in JPEG and resize it. I've seen several examples with GDI+, some non-free components and I remember WPF has some good stuff about imaging. GDI+ is pretty old and the WPF stuff maybe has no benefits on a server environment though. This has to work in a ASP.NET MVC application that runs on full trust, and if possible, synchronously. What would you recommend? UPDATE: Based on <a href="https://stackoverflow.com/questions/5882307/generating-image-thumbnails-in-asp-net/5882623#5882623">Mantorok's answer</a> I have worked out this example, but it's still GDI+, and it crashes if I try with a large image: <pre><code>public void GenerateThumbnail(String filename, Int32? desiredWidth, Int32? desiredHeight, Int64 quality, Stream s) { using (Image image = Image.FromFile(filename)) { Int32 width=0, height=0; if ((!desiredHeight.HasValue && !desiredWidth.HasValue) || (desiredHeight.HasValue && desiredWidth.HasValue)) throw new ArgumentException( "You have to specify a desired width OR a desired height"); if (desiredHeight.HasValue) { width = (desiredHeight.Value * image.Width) / image.Height; height = desiredHeight.Value; } else { height = (desiredWidth.Value * image.Height) / image.Width; width = desiredWidth.Value; } using (var newImage = new Bitmap(width, height)) using (var graphics = Graphics.FromImage(newImage)) using (EncoderParameter qualityParam = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, quality)) using (EncoderParameters encoderParams = new EncoderParameters(1)) { graphics.DrawImage(image, 0, 0, width, height); ImageCodecInfo jpegCodec = ImageCodecInfo.GetImageEncoders(). Single(e => e.MimeType.Equals("image/jpeg", StringComparison.Ordinal)); encoderParams.Param[0] = qualityParam; newImage.Save(s, jpegCodec, encoderParams); } } } </code></pre>
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<.net><asp.net><wpf><image-processing><gdi+>
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Generating image thumbnails in ASP.NET?
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