This code will replace characters efficiently without using Regex. Instead of using the normal string type the coder uses the StringBuilder class. I would assume this would only be good for simple replace jobs but for tougher jobs I would still stick to Regex.

If anyone has tried using the .NET Graphics API, they know that replacing pixel colors takes a long time to complete. I did some research and found a good source. This code will adjust the color to greyscale by Binary.
The page is http://www.navicosoft.com/software_articles/softwares_articles_index.html for more information. It is under Basic Image Processing in the list of articles.