Photoshop to FCP

Hello,

I have been using images at 300 dpi for my TV slideshows (is this unecessary?)and now I am lost as to what the best scanning resolution is for video slideshows. I have used the preset: PAL D1/DV 720 x 526 (with guides), and using the copy and paste, I've imported an image that was 300 dpi. Sure enough it was giant when I pasted into the new document with guides, at 72.

Any attempt to change the 72 dpi and the preset becomes a cutom preset and I loose the guides. Does this mean that for TV you only need image to be 72 dpi?

The method I have been using from start to finish is as follows:

1. Scan photo at 300dpi
2. Save image as a jpeg then crop and lighten till satisfied
3. Import into Final Cut Pro and add transitions
4. Export FCP file to Compressor and Compress file

I'd like to be in complete control and know what I will be able to view, at the best resolution, without any unwanted cropping or distortion.

I also use a projector to display the slideshow and wondered if I need to take that into consideration as regards best resolution for the final output? (TV or Projector)

Please forgive me, I'm from a print background.

If you could please help that would be much appreciated

Thanking you,

Joseph

17" PowerBook G4, OS 10.4.6, Final Cut Studio, Photoshop CS2, Canopus ADVC110