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POWorking with images: Parameter is not valid
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  1. POWorking with images: Parameter is not valid
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    copied!<p>It all started with <a href="https://stackoverflow.com/questions/4161873/reduce-image-size-c-sharp/4161930#4161930">a very usefull piece of code, that I found here on Stackoverflow</a>.</p> <p>Then, I decided to make my own tweaks, and add image resizing to this method. However, after struggling with this problem I am now being presented with the information of: <strong>"The parameter is not valid"</strong>.</p> <p>I would also like to highlight that, despite the error, the images are being sucessfully uploaded. However, they are not being optmized as intended.</p> <hr> <p><strong>This is the part of the code in my "upload button":</strong></p> <pre><code>fuOne.SaveAs(Server.MapPath("~/imgFolder/temp/") + fuOne.FileName); System.Drawing.Image imgUploaded = System.Drawing.Image.FromFile(Server.MapPath("~/imgFolder/temp/") + fuOne.FileName); SaveJpeg(Server.MapPath("~/imgFolder/temp/") + fuOne.FileName, imgUploaded, 60, 300, 300); </code></pre> <hr> <p><strong>This is the full code of my SaveJpeg method:</strong></p> <pre><code>public static void SaveJpeg(string path, System.Drawing.Image imgUploaded, int quality, int maxWidth, int maxHeight) { if (quality &lt; 0 || quality &gt; 100) throw new ArgumentOutOfRangeException("quality must be between 0 and 100."); // resize the image int newWidth = imgUploaded.Width; int newHeight = imgUploaded.Height; double aspectRatio = (double)imgUploaded.Width / (double)imgUploaded.Height; if (aspectRatio &lt;= 1 &amp;&amp; imgUploaded.Width &gt; maxWidth) { newWidth = maxWidth; newHeight = (int)Math.Round(newWidth / aspectRatio); } else if (aspectRatio &gt; 1 &amp;&amp; imgUploaded.Height &gt; maxHeight) { newHeight = maxHeight; newWidth = (int)Math.Round(newHeight * aspectRatio); } Bitmap newImage = new Bitmap(imgUploaded, newWidth, newHeight); Graphics g = Graphics.FromImage(imgUploaded); g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear; g.DrawImage(imgUploaded, 0, 0, newImage.Width, newImage.Height); g.Dispose(); imgUploaded.Dispose(); // Lets start to change the image quality EncoderParameter qualityParam = new EncoderParameter(Encoder.Quality, quality); // Jpeg image codec ImageCodecInfo jpegCodec = GetEncoderInfo("image/jpeg"); EncoderParameters encoderParams = new EncoderParameters(1); encoderParams.Param[0] = qualityParam; System.Drawing.Image imgFinal = (System.Drawing.Image)newImage; newImage.Dispose(); imgFinal.Save(path, jpegCodec, encoderParams); imgFinal.Dispose(); } /// &lt;summary&gt; /// Returns the image codec with the given mime type /// &lt;/summary&gt; private static ImageCodecInfo GetEncoderInfo(string mimeType) { // Get image codecs for all image formats ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders(); // Find the correct image codec for (int i = 0; i &lt; codecs.Length; i++) if (codecs[i].MimeType == mimeType) return codecs[i]; return null; } </code></pre> <hr> <h1>Follow up</h1> <p>It seems that the code had a couple of errors. Being one in the encoding and another in the image saving.</p> <p>The follow up of Aristos is very important to solving this problem, because it fixes my lousy mistake when saving the file. :)</p>
 

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