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        ÔÚÄÚºËĿ¼ÖÐ make menuconfig
        Device Drivers ---->   Graphics support ---->
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          ppmquant 224 temp1.ppm > temp2.ppm                  //ת»»³É224ÑÕÉ«
          pnmnoraw temp2.ppm > logo.ppm                            //ת»»³Éascii¸ñʽ
  
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