word转成html，数学公式上的文字会被加粗，怎么解决？

[SqlServer2008]

通过asp.net 将用户上传的word转成html，word里如果含有数学公式，转出来的数学公式图片文字都被加粗了，这个问题怎么解决？
直接打开word文档，另存为html不会出现这个问题。

例如：
word上有这么一个公式：


转出来后公式会变成图片：


图片上的文字都被加粗了。

[SqlServer2008]

居于office 转的

                object FileName = savePath;
                object FileFormat = WdSaveFormat.wdFormatFilteredHTML;
                object LockComments = Type.Missing;
                object Password = Type.Missing;
                object AddToRecentFiles = Type.Missing;
                object WritePassword = Type.Missing;
                object ReadOnlyRecommended = Type.Missing;
                object EmbedTrueTypeFonts = Type.Missing;
                object SaveNativePictureFormat = Type.Missing;
                object SaveFormsData = Type.Missing;
                object SaveAsAOCELetter = Type.Missing;
                object Encoding = Type.Missing;
                object InsertLineBreaks = Type.Missing;
                object AllowSubstitutions = Type.Missing;
                object LineEnding = Type.Missing;
                object AddBiDiMarks = Type.Missing;


                doc.SaveAs(ref FileName, ref FileFormat, ref LockComments, ref Password, ref AddToRecentFiles, ref WritePassword, ref ReadOnlyRecommended, ref EmbedTrueTypeFonts, ref SaveNativePictureFormat, ref SaveFormsData, ref SaveAsAOCELetter, ref Encoding, ref InsertLineBreaks, ref AllowSubstitutions, ref LineEnding, ref AddBiDiMarks);