如何去除pdf格式ppt背景

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select * from tbl_Articles WHERE ArticleID=2789679 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=2789679 LIMIT 0,1
select * from tbl_Articles_sphinx where id=2789679 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(150801,2448534,1736686,1081221,1062566,1904158,2280132,536062,1085008,1130328,293860,2400295,784180,1130298,1131989,1910393,1980532,1057641,1286177,1426636,2383252,1117456,1119876,229582,1544708,2457649,1464041,593917,701368,282437) ORDER BY field (ArticleID,150801,2448534,1736686,1081221,1062566,1904158,2280132,536062,1085008,1130328,293860,2400295,784180,1130298,1131989,1910393,1980532,1057641,1286177,1426636,2383252,1117456,1119876,229582,1544708,2457649,1464041,593917,701368,282437)