The SetPixel() method in the AnyBitmap class is used to apply colors to specific pixels on an image. This is useful for drawing or simply creating a line on an image using a specified color.

The SetPixel() method is found under the AnyBitmap class in IronSoftware.Drawing. It accepts three parameters: the x coordinate, the y coordinate, and an IronSoftware.Drawing.Color object. The method can be called on a AnyBitmap object to apply the color to the AnyBitmap image.

In the provided code snippet, a sample image to be used was loaded using the AnyBitmap.FromFile() method, which returns a AnyBitmap object. A for loop was used to create a colored horizontal line by changing the x coordinate. The bitmap with the applied pixels is then saved to the machine with a different name.