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POc# Image scaling quality different between dev and production environment
 

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  1. POc# Image scaling quality different between dev and production environment
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    <p>i have created a function that resizes and crops a picture and then saves the resulting image file. In my development environment it works just great, but on production the resulting image is "grainy". You can see the different quality here <a href="http://test.powersport.it/canc2.aspx" rel="nofollow">http://test.powersport.it/canc2.aspx</a></p> <p>Here is the code that generates the resized and cropped image</p> <pre><code> // width: width of cropped img - height: height of cropped img System.Drawing.Bitmap thumbnail = new Bitmap(width, height); // image: original System.Drawing.Image containing full size img thumbnail.SetResolution(image.HorizontalResolution, image.VerticalResolution); // size[0]: width of resized img - size[1]: height of resized image System.Drawing.Image mini = new Bitmap(image, size[0], size[1]); System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(thumbnail); g.InterpolationMode = InterpolationMode.HighQualityBicubic; g.SmoothingMode = SmoothingMode.HighQuality; g.PixelOffsetMode = PixelOffsetMode.HighQuality; g.CompositingQuality = CompositingQuality.HighQuality; g.DrawImage(mini, ((width - size[0]) / 2), ((height - size[1]) / 2), size[0], size[1]); EncoderParameters encoderParameters; encoderParameters = new EncoderParameters(1); ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders(); // img: original file name switch (Path.GetExtension(img).ToLower()) { case ".png": // info[4] thumbnail.Save(dest, System.Drawing.Imaging.ImageFormat.Png); break; case ".bmp": // info[0] thumbnail.Save(dest, System.Drawing.Imaging.ImageFormat.Bmp); break; case ".tiff": // info[3] encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionLZW); thumbnail.Save(dest, info[3], encoderParameters); break; case ".tif": // info[3] encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Compression, (long)EncoderValue.CompressionLZW); thumbnail.Save(dest, info[3], encoderParameters); break; default: //jpeg info[1] encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, compression); thumbnail.Save(dest, info[1], encoderParameters); break; } </code></pre> <p>Any help is appreciated. Thanks.</p> <p><strong>UPDATE</strong>: i've tried with PNG, BMP and TIFF but they have the same problem</p>
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    1. COWhat's the `compression` argument you are feeding into `encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, compression);` for jpeg images?
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    2. COSorry, i forgot to specify that `compression` is a parameter of my function, in this case its value is 100 (both dev and production)
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    3. CODoes it have the same problem for all file types, png, bmp, tiff, etc. or just for one of them, if so which one?
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