Save a 32-bit Bitmap as 1-bit .bmp file in C#

Question

What is the easiest way to convert and save a 32-bit Bitmap to a 1-bit (black/white) .bmp file in C#?

Answer 1

The easiest way to do achieve this by using the Clone()

using System.Drawing.Imaging;

var original = //your source image;
var rectangle = new Rectangle(0, 0, original.Width, original.Height);

var bmp1bpp = original.Clone(rectangle, PixelFormat.Format1bppIndexed);

As disclaim this will maybe not the fastest way to do this there are much faster way's to do this