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POImage cropping and resizing ImageMagick vs GDI+ in C#
 

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  1. POImage cropping and resizing ImageMagick vs GDI+ in C#
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    <p>I have a web application where users can upload pictures to create their galleries. Years ago when I wrote the application I choose <a href="http://en.wikipedia.org/wiki/ImageMagick" rel="nofollow">ImageMagick</a>, and I did all my cropping and resizing with ImageMagick.</p> <p>Now that I am rewriting the application from scratch, <strong>I replaced ImageMagick with native <a href="http://en.wikipedia.org/wiki/Graphics_Device_Interface#Windows_XP" rel="nofollow">GDI+</a></strong> operations, but the more I learn around GDI+ the more I am scared I made the wrong choice.</p> <p>Everywhere I read that GDI+ is for the desktop and should not be used on a server application. I don't know the details, but I guess it's for the memory consumption, and indeed I can see <strong>GDI+ is using more memory</strong> to do the <strong>same operation</strong> (crop and resize) over the <strong>same image</strong> than ImageMagick (while to be honest <strong>GDI+ is faster</strong>).</p> <p>I believed GDI+, ImageMagick or any other library should be more or less the same for those basic operations, and I liked the idea of using native GDI+ believing whatever MS is shipping with <a href="http://en.wikipedia.org/wiki/.NET_Framework" rel="nofollow">.NET</a> should be at least OK.</p> <p>What is the right approach/tool to use?</p> <p>This is the code I use to crop:</p> <pre><code>internal Image Crop(Image image, Rectangle r) { Bitmap bmpCrop; using (Bitmap bmpImage = new Bitmap(image)) { bmpCrop = bmpImage.Clone(r, bmpImage.PixelFormat); bmpImage.Dispose(); } return (Image)(bmpCrop); } </code></pre> <p>This is the code I use to resize:</p> <pre><code>internal Image ResizeTo(Image sourceImage, int width, int height) { System.Drawing.Image newImage = new Bitmap(width, height); using (Graphics gr = Graphics.FromImage(newImage)) { gr.SmoothingMode = SmoothingMode.AntiAlias; gr.InterpolationMode = InterpolationMode.HighQualityBicubic; gr.PixelOffsetMode = PixelOffsetMode.HighQuality; gr.DrawImage(sourceImage, new Rectangle(0, 0, width, height)); gr.Dispose(); } return newImage; } </code></pre>
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    1. USPeter Mortensen
    1. USMax Favilli
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    1. COI'm *guessing* here, but certain parts of the GDI+ might depend upon an environment that contains a valid desktop, like with a logged-in user, as opposed to an NT service.
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      1. USChris O
    2. COWhen using Imagemagick if you are saving as jpg you can use the jpg hint to speed up the process or try using Imagick. Can GDI+ only be used on a Windows server?
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    3. COGuess so but I am using IIS7 and .Net anyway.
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      1. USMax Favilli
 

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