save an image as a bitmap without loosing quality
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I had a problem of printing quality and I described it in this link :
[enter link description here][1]


  [1]: http://stackoverflow.com/questions/11644115/how-to-improve-printed-text-quality-after-using-graphics-drawstring

I tried many different solutions that helped other guys with similar prob but they don't work for me because I have a new prob of saving image as bitmap(with low quality) 

finally I decided to ask my current question , because as u see in above link , my prob starts after saving the image in system(96dpi) and restoring it . but I have no way so I'm looking for a way that make it possible to save an image (that has pixels drawn from a graphic) without loosing quality.

thanx in advance