This component rasterize the page to bitmap. Then you can convert it to other image format.
http://code.google.com/p/mupdf-converter/feeds[
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Example:
int page = 1;
int dpi = 200;
MuPDFLib.RenderType RenderType = RenderType.RGB;
bool rotateAuto = true;
string file = @"C:\test.pdf";
string password = "";
MuPDFLib.MuPDF pdfDoc = new MuPDFLib.MuPDF(file, password);
pdfDoc.Page = page;
if (picPDF.Image != null)
picPDF.Image.Dispose();
Bitmap bm = pdfDoc.GetBitmap(0, 0, dpi, dpi, 0, RenderType,
rotateAuto, false, 0);
pdfDoc.Dispose();