pdf to jpg resolution problem

[mij]

I'm trying to convert each page of a pdf file to a low resolution jpg and a high resolution one. I'm using

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convert -scale 2000x1000 file.pdf hi-res%d.jpg
convert -scale 1000x500 file.pdf lo-res%d.jpg


It does creates a 1000x500 and 2000x1000 jpg for each page of the pdf, but both images are identical in definition. I mean, the hi-res image is just a pixelated scaled-up version of the lo-res one, even the text, wich should not be afected by resolution as far as I know.
Is there just a limit in the resolution that can be achieved converting a pdf into jpg??

[Bonzo]

Look back through the previous posts there are quite a few questions about this. From memory you need to add a -density before reading in the image?
http://www.imagemagick.org/script/comma ... p?#density

Also -resize may be better than -scale; you can then try different filters.
http://www.imagemagick.org/script/comma ... hp?#resize

Note: Read the image in first.

Would something like this work ?

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convert -density 400 file.pdf -scale 2000x1000 hi-res%d.jpg

[mij]

It just worked perfetcly. Thanks