create an empty BitmapSource in C#

Thanks to Arcutus hint I have this now (wich works fine):

var i = BitmapImage.Create(    2,    2,    96,    96,    PixelFormats.Indexed1,    new BitmapPalette(new List<Color> { Colors.Transparent }),    new byte[] { 0, 0, 0, 0 },    1);

If I make this image smaller I get an ArgumentException. I have no clue why I can't create a smaller image that 2x2px.

Use the Create method.

Example stolen from MSDN: :)

int width = 128;int height = width;int stride = width/8;byte[] pixels = new byte[height*stride];// Try creating a new image with a custom palette.List<System.Windows.Media.Color> colors = new List<System.Windows.Media.Color>();colors.Add(System.Windows.Media.Colors.Red);colors.Add(System.Windows.Media.Colors.Blue);colors.Add(System.Windows.Media.Colors.Green);BitmapPalette myPalette = new BitmapPalette(colors);// Creates a new empty image with the pre-defined paletteBitmapSource image = BitmapSource.Create(                                         width, height,                                         96, 96,                                         PixelFormats.Indexed1,                                         myPalette,                                          pixels,                                          stride);

The way to create such an image without allocating a big managed byte array is to use TransformedBitmap.

var bmptmp = BitmapSource.Create(1,1,96,96,PixelFormats.Bgr24,null,new byte[3]{0,0,0},3);var imgcreated = new TransformedBitmap(bmptmp, new ScaleTransform(width, height));