用printDocuments如何打印出高清图片?(高分,不够再加,大虾进)

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我用printDocuments做了个控件,在对他的graphics进行操作时,在graphics里写入了一张图片,和几个文字,在输出到打印机(我的打印机是虚拟的,office自带的那个Microsoft Office Document Image Writer)的同时,也把Graphics的内容存入了一张bmp图片,但是输出的mdi文件的内容和bmp的图片的内容简直不能比,太模糊了。后来我以为是虚拟打印机的问题,于是将打印输出到一个证卡打印机中,出来的图片和字还是非常模糊。请各位大侠指教,当然不一定局限于用printdocument这个东西,其它方法也可以,只要可以输出高清的图片到打印机就行。谢谢
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