python将pdf转成图片

使用Python的fitz库，参考代码：

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import fitz

sizelist = [5, 5.5, 6.5, 7.5, 8, 9,
            10, 10.5, 12, 14, 16, 18,
            20, 22, 24, 26, 28, 36,
            42, 48, 60, 72]

for si in sizelist:
    print(si)
    docs = fitz.open("字库/"+str(si)+"/字库.pdf")
    pagenum = 1
    for i in range(0, docs.pageCount):
        page = docs.getPagePixmap(i)
        page.writePNG("textdb/"+str(si)+"/page" + str(pagenum)+".png")
        pagenum = pagenum + 1