[magick-users] wrong density when converting PDF to PNG

[Nagy Gabor]

How could I convert a PDF to PNG, with good density, I already "google it",
but it still doesn't work:

convert *.pdf -density 600 original-png/file.png

but is still gives unreadable text in the png file :(

I also read that a PDF file doesn't store density information, then how to?

thank you in anticipation