Databases
StackOverflow2013
Postsdbo
POGenerating image thumbnails in ASP.NET?
Body
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POGenerating image thumbnails in ASP.NET?
    text
    copied!<p>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.</p> <p>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.</p> <p>This has to work in a ASP.NET MVC application that runs on full trust, and if possible, synchronously.</p> <p>What would you recommend? </p> <p><strong>UPDATE:</strong></p> <p>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:</p> <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 &amp;&amp; !desiredWidth.HasValue) || (desiredHeight.HasValue &amp;&amp; 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 =&gt; e.MimeType.Equals("image/jpeg", StringComparison.Ordinal)); encoderParams.Param[0] = qualityParam; newImage.Save(s, jpegCodec, encoderParams); } } } </code></pre>
 

Querying!

 
Guidance
An individual column

Larger individual text columns get their own page to allow for proper reading.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload