WPF

HwndSource hwndSource = PresentationSource.FromVisual(this) as HwndSource;
hwndSource.CompositionTarget.RenderMode = RenderMode.SoftwareOnly; 

Insincere Dave wrote:

I had already tried 2904,5000 and didn't see anything.

Insincere Dave wrote:

You could try forcing software rendering and see if it is a driver issue

Insincere Dave wrote:

You could try forcing software rendering and see if it is a driver issue

Insincere Dave wrote:

I had already tried 2904,5000 and didn't see anything.

Insincere Dave wrote:

The software rendering code goes in the loaded event and you apply it to the window, but im not sure it will have any effect if you are just saving the image and not displaying it.

void ScaleBitmapImage(string imagePath, double targetSize, Image image)
{
    Uri uri = new Uri(imagePath);
    BitmapImage bitmapImage = new BitmapImage(uri);
    var scale = targetSize / bitmapImage.PixelWidth;
    TransformedBitmap scaledBitmap = new TransformedBitmap();
    scaledBitmap.BeginInit();
    scaledBitmap.Source = bitmapImage;
    scaledBitmap.Transform = new ScaleTransform(scale, scale);
    scaledBitmap.EndInit();
    image.Source = scaledBitmap;
}

Insincere Dave wrote:

Im using VS 2010 on vista

Insincere Dave wrote:

I have also installed the platform update for vista which may have updated the windows imaging component.

Insincere Dave wrote:

I tried scaling an Image control and using RenderTargetBitmap and didn't notice any quality degradation

void ScaleUsingRTB(string inFile, string outFile, double scale)
{
	Uri uri = new Uri(inFile);
	BitmapImage bitmapImage = new BitmapImage(uri);
	var image = new Image
	            	{
	            		Source = bitmapImage, Width = bitmapImage.PixelWidth*scale, Height = bitmapImage.PixelHeight*scale
	            	};
	image.Measure(new Size(image.Width,image.Height));
	image.Arrange(new Rect(0,0,image.Width,image.Height));
	RenderTargetBitmap rtb = new RenderTargetBitmap((int) image.Width, (int) image.Height, 96, 96, PixelFormats.Pbgra32);
	rtb.Render(image);

	Save(outFile,rtb);
}

Insincere Dave wrote:

Save(outFile,rtb);