Thank you both for your fast answers! I'm using now the technique described in your blog article and it works fine. :) My ImageMagick downsized jpeg images are still a tiny bit less sharp than GDI+ but filesize is also smaller like 30-40%. I'm happy with that for now! Image resizing seems to be a big topic anyways if I look at that ImageMagick documentation about that.
Best regards Patrick 2013/3/16 Daniel Lo Nigro <li...@dan.cx> > Microsoft's .NET Framework uses GDI+ (which is a part of Windows) whereas > Mono uses libgdiplus <http://www.mono-project.com/Libgdiplus> which is a > wrapper around the Cairo graphics library <http://www.cairographics.org/>. > This is why you're seeing differences between the two. > > The link you posted uses the ImageMagick library, which is something I'd > recommend if you're not happy with the quality of the System.Drawing > output. ImageMagick (or GraphicsMagick, which is a fork of it) is what I > use with PHP and Node.js and it works pretty well. If you don't want to > mess around with P/Invoke and native libraries, you could just use > System.Diagnostics.Process to run ImageMagick. Just get it working > perfectly from the command-line, and then copy the command into your app :). > > See the ImageMagick docs: http://www.imagemagick.org/Usage/resize/#resize > > > On Sat, Mar 16, 2013 at 4:47 AM, Patrick Epstein <epsto...@gmail.com>wrote: > >> Hello, >> >> I'm resizing images with the same c# code on windows and linux and the >> results on linux are worse. Just a bit less than acceptable. >> What should I do to get comparable good results? >> >> What I'm doing right now: >> >> image.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone); >> image.RotateFlip(System.Drawing.RotateFlipType.Rotate180FlipNone); >> >> var resized = resizedImage = image.GetThumbnailImage(width, height, >> null, IntPtr.Zero); >> >> var encoderParameters = new EncoderParameters(1); >> encoderParameters.Param[0] = new >> EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 90); >> >> saving... >> >> Or is this the way to go? >> >> http://www.toptensoftware.com/Articles/17/High-Quality-Image-Resampling-in-Mono-Linux >> >> Best regards, >> Patrick >> >> _______________________________________________ >> Mono-aspnet-list mailing list >> Mono-aspnet-list@lists.ximian.com >> http://lists.ximian.com/mailman/listinfo/mono-aspnet-list >> >> >
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