word转pdf，图片里的公式被提取成文本，但符号变成了方块。
有什么办法可以禁止将图片里的内容提取成文本吗？
word：
pdf：...TrueType Fonts Location in Java Specify various TrueType font sources:...folder, user sources, loading fonts from a stream, a file system...
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delete comments from RTF file through online app for free. Android API code to manage comments of RTF files....such as JogAmp JOGL, Harfbuzz font engine, Java Advanced Imaging...