Under .NET Framework 2.0, when I was executing this code:

            loGraphics.SmoothingMode = Drawing.Drawing2D.SmoothingMode.HighQuality
            loGraphics.InterpolationMode = Drawing.Drawing2D.InterpolationMode.HighQualityBicubic
            loGraphics.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality
            loGraphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality

It was resizing an image with high quality JPG such as Compression Quality Factor=95. But, under .NET Framework 4.0, this resizes the image as if it would be Compression Quality Factor=75. This is the default JPG setting for most software. When I use the default under LViewPro, I can easily see that I have a poor quality. This is what I have presently under the new framework. So, something changed in there. As a test, if I use LViewPro and change it to 95, I will obtain a high precised image, which is what my code use to produce with the old framework.

Anyone have an idea what could be a factor here?