Thumbnail image saved with worse quality on Windows Server 2003
- by Angelo
Hello,
In asp.net 2.0 application I am trying to create thumbnails from uploaded images. However when I test the application on my PC under Windows7 it works fine, but on the real Windows 2003 Server the resized image has worse quality.
Where this difference could come from? Different JPEG codec or what, if Yes how it can be updated on Win 2003 Server? Thanks!
Here is the code:
Resize of the Image:
Bitmap newBmp = new Bitmap(imgWidth, imgHeight, PixelFormat.Format24bppRgb);
newBmp.SetResolution(inputBmp.HorizontalResolution,
inputBmp.VerticalResolution);
//Create a graphics object attached to
the new bitmap Graphics newBmpGraphics
= Graphics.FromImage(newBmp);
newBmpGraphics.InterpolationMode =
InterpolationMode.HighQualityBicubic;
newBmpGraphics.SmoothingMode =
SmoothingMode.HighQuality;
newBmpGraphics.PixelOffsetMode =
PixelOffsetMode.HighQuality;
newBmpGraphics.DrawImage(inputBmp, new
Rectangle(0, 0, imgWidth, imgHeight),
new Rectangle(0, 0, inputBmp.Width,
inputBmp.Height), GraphicsUnit.Pixel);
Save of the Image:
System.IO.Stream imgStream = new
System.IO.MemoryStream();
//Get the ImageCodecInfo for the
desired target format ImageCodecInfo
destCodec =
FindCodecForType(ImageMimeTypes.JPEG);
if (destCodec == null) {
//No codec available for that format
throw new ArgumentException("The requested format image/jpeg does not
have an available codec installed",
"destFormat"); }
//Create an EncoderParameters
collection to contain the //parameters
that control the dest format's encoder
EncoderParameters destEncParams = new
EncoderParameters(1);
EncoderParameter qualityParam = new
EncoderParameter(System.Drawing.Imaging.Encoder.Quality,(long)quality);
destEncParams.Param[0] = qualityParam;
//Save w/ the selected codec and
encoder parameters
inputBmp.Save(imgStream, destCodec,
destEncParams);
Bitmap destBitmap = new
Bitmap(imgStream);
