[Mono-aspnet-list] SmoothingMode.Antialias problem

kalljoel kalljoel at gmail.com
Mon Jan 4 08:07:41 EST 2010


I'm using Mono to resize images on a web server. Unfortunately the quality
is not what it should be, the rendered image is pixelated, though I use
HighQualityCubic interpolation mode and SmoothingMode.AntiAlias. Using the
same code on windows gives me better results.

This is my code.

returnImg = new Bitmap(fullSizeImg, size, Convert.ToInt32(origHeight *
((float)size / (float)origWidth)));

Graphics oGraphics = Graphics.FromImage(returnImg);
oGraphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
oGraphics.SmoothingMode = SmoothingMode.AntiAlias;

oGraphics.DrawImage(fullSizeImg, 0, 0, size, Convert.ToInt32(origHeight *
((float)size / (float)origWidth)));

ImageCodecInfo info = null;

ImageCodecInfo[] encoderInfoArray = ImageCodecInfo.GetImageEncoders();
foreach (ImageCodecInfo imageCodecInfo in encoderInfoArray)
    if (0 == String.Compare("image/png", imageCodecInfo.MimeType, true))
        info = imageCodecInfo;

if (info != null)

    EncoderParameters encParams = new EncoderParameters(1);
    long quality = 95;
    encParams.Param[0] = new

    returnImg.Save(Response.OutputStream, info, encParams);
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