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In an NLE, you are really only using the pixel x pixel dimensions. DPI/PPI mean nothing, except a larger file size.
You can set the PPI to 72 and be fine for TV. You might want to bump it up slightly, if you are outputting to a progressive file for display on a computer, but even then, you'll not need much.
PSD will be as clear a format, as you can get. I'd not bother with any JPG compression, as by the time that you lower the compression settings, i.e. compress less, to keep the quality, you will not have compressed all that much.
For zooming in, you do not need for the image to be much larger than the preset for your Project. The FAQ's at the top of the page have some good recs. for the exact sizing. If you will be panning, while zoomed out, you'll want just enough extra to allow for that movement.
Depending on the native resolution of your PDF's image, you should be able to get a reasonably sharp image onto the TV screen. Also, judge the final look of this image on a TV, if that is your final output, as it will appear better, than on the computer screen. I use a DVD RW for this sort of testing and just re-use the discs.
Last, do all of your re-sizing (as much as is possible) in Photoshop. The algorithms are a bit better than in an NLE. Now, for a dynamic zoom, you have no choice but to use Motion>Scale.
The best quality results for video, we've found, are achieved from photos no larger than 1000x750 pixels in size.
At first that seems to go contrary to common wisdom, which states that higher resolution pictures produce cleaner results. But, since video is essentially only 640x480 pixels, the closer to this resolution, the better your video output results.
Using 1000x750 pixels gives you great results and leaves room for panning and zooming, per the FAQs at the top of this forum.
It's the number_of_pixels X number_of_pixels that is all important in video work. The DPI or PPI is irrelevant and ignored. Changing DPI and leaving the pixels the same (and the compression the same, if any) would result in a file the same size. All DPI is used for is to tell your printer how big to scale the image to print it.
Of course, DPI is also important when scanning. The more DPI, the more pixels for a given picture.
Peter is correct.
DPI is only revelent when pronting and scanning.
there is an easier solution, just rename your file from *.pdf to *.ai and import it to Premiere elements directly, since ai as a nativer format is supported by premiere elemtns, somming in wont make the image blurry. lets know if it works for you.
For what it's worth, PDFs, as a native format, are also supported by Premiere Elements.