指定した文字を入れた画像ファイルを作る

sampleImage.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Drawing;
using System.Drawing.Imaging;

namespace TextImage
{
  class Program
	{
		static void Main(string[] args)
		{
			if (args.Length < 5 || args.Any(x => x == "-?")) {
				Console.Error.Write(@"
TextImage.exe width height text filename fileformat

TextImage.exe 600 600 ""sample image"" ""d:\desktop\sample.png"" png

fileformat : jpg | png | gif | bmp
");
				return;
			}


			var width = int.Parse(args[0]);
			var height = int.Parse(args[1]);
			var text = args[2];
			var filename = args[3];

			var f = args[4];
			ImageFormat format = f == "jpg" ? ImageFormat.Jpeg 
				: f == "png" ? ImageFormat.Png
				: f == "gif" ? ImageFormat.Gif
				: f == "bmp" ? ImageFormat.Bmp 
				: ImageFormat.Jpeg
				;


			using (var bitmap = new Bitmap(width, height))
			using (var g = Graphics.FromImage(bitmap)) {

				var font = new Font("Consolas", 18);
				
				g.FillRectangle(Brushes.White, g.VisibleClipBounds);
				g.DrawString(text, font, Brushes.Black, 10, 10);

				bitmap.Save(filename, format);
			}

		}
	}
}