[Mono-list] Mono image scaling quality

[Daniel Lo Nigro]

Hi everyone,

I've written some code to generate thumbnails for an image listing. The
thumbnails look good on Windows but are significantly lower quality when
the same code is ran on Mono. I have a feeling Mono may be using linear
interpolation even though I'm explicitly saying to use high quality bicubic.

Here's a screenshot showing the difference. Output from Mono is on the left
and MS.NET on the right: http://ss.dan.cx/2013/08/10-21.36.39.png

Here's the relevant code:

var thumb = new Bitmap(width, height);
using (var graphics = Graphics.FromImage(thumb))
{
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.DrawImage(sourceImg, 0, 0, width, height);
}
return thumb;

Any ideas? Should I just defer thumbnail creation to something like
ImageMagick/GraphicsMagick or are there some other options I can set in
Mono to make it produce higher-quality output?
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