[poppler] Question about setting PPI when generating image from pdftoppm

[Min Su]

Hi All,

I'm trying to set PPI when generating image from pdftoppm,but it seems like
we only have parameters to set DPI "-r". I think the "r" here means
resolution and the value should be a DPI. Since DPI is different from PPI,
what if I want to set resolution by using PPI? Is there a way to translate
them or there's another parameter which can take PPI?

Thanks,

Min
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