Extracting from PDF in Preview (bad quality)

I have a huge PDF document, but need only a few of those pages, so I thought I'd extract the desired pages.
Having the PDF file opened in Preview, and on the first page I wanted to save I went to "File"-"Save as" and chose a suitable format.
The problem however is that the resulting saved file is of terrible quality. Nothing like the original PDF file at all.
I've tried a variety of formats: Photoshop, TIFF, PNG and so on.
What am I doing wrong?

Hi,
I'm not sure about the quality issue, but as an alternative have you tried choosing the desired page numbers in the Print dialog and select 'PDF > Save as PDF...' at the bottom to save out the pages?

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I've seen several posts about this but have not been able to find an actual solution and it would not let me reply to any of the posts...
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Did you mean to ask this on the Premiere Pro forum? Your post mentions After Effects. Are you looking for a solution using Premiere Pro or After Effects?
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Now the quality is not "really" bad anymore, it is bad. ;-)
The quality got better, but still there is a difference between drawing shapes and cell borders. And the difference is causing problems with customers, who are demanding professional quality.
Here is a .jpg of the original Excel table. The drawing shape is the outer one, the cell borders are the lines beneath the data. Both line types are very delicat. This is how it should be.
And this is how it looks after a pdf-print with setting "high quality print" (2400 dpi).
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Extracting from PDF in Preview (bad quality)

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