Sorry don't use PP but do use PS for this job. I would always use Grayscale or lab conversion to do this job depending if it was for a newspaper or not. Have a look at this first ling which gives info on colour modes and examples of results in PP; http://corelphoto-paintx5.pp.ua/Chan...of_images.html
The other link again gives a one click solution and if you are happy with fine go ahead and use it if not comeback and I will give you some more help but it will be based on PS. Also you can do a search yourself converting RGB to Grayscale in Photo Paint: http://community.coreldraw.com/blogs...graysacle.aspx