/// <summary>
/// Given a filename and a ImageInfo, produces a PngWriter object, ready for writing.</summary>
/// <param name="fileName">Path of file</param>
/// <param name="imgInfo">ImageInfo object</param>
/// <param name="allowOverwrite">Flag: if false and file exists, a PngjOutputException is thrown</param>
/// <returns>A PngWriter object, ready for writing</returns>
public static PngWriter CreatePngWriter(string fileName, ImageInfo imgInfo, bool allowOverwrite)
{
return(new PngWriter(OpenFileForWriting(fileName, allowOverwrite), imgInfo, fileName));
}