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I have the following code to take an image and generate the thumbnail.
how can I alter the quality or compression to get smaller file sizes programatically?
Image thumbNail = image.GetThumbnailImage(Width, Height, null, new IntPtr());
If you truly need better control over the thumbnails produced, you will be better off producing your own by manually generating an image of smaller size and different quality. The GetThumbnailImage dows not give you much control.
See this article for how it’s done.
http://www.switchonthecode.com/tutorials/csharp-tutorial-image-editing-saving-cropping-and-resizing