Since Vegas Pro version 9 gigapixel resolution for still images is supported. How well this works depends on many things.
I have an earthview foto (jpeg) which I use for a zoom demo in Vegas Pro. This photo is 21.600x21.600 pixel of size - 446,56 million pixels. I can't open this photo in my grafic apps (them either freeze or crash). But I can open and animate it (with Pan/Crop) in Vegas Pro 9 and 10. Though I use a separate project just to animate this one photo and there is some latency when editing it it just works fine and stable (Vegas Pro 64 bit on a Dell Precision notebook with 4 GB RAM and an intel Centrino dualcore CPU (2x2,8 GHz).
Leslie,
You could look at the unpacked (raw) size of your image(s). A 4000x3000 image has a raw size of 34MB if no alpha. An 8000x6000 image is 137MB unpacked. The packed (compressed) size is not an indicator.
I think I would keep each frame at its original resolution (is that 4000x3000?), which would make for a pretty big file. I agree PNG is probably the most manageable format.
A 12000x9000 final image would occupy 300+ MB of RAM, which should be reasonable in Vegas.
Is the Ektachrome border something you found or made up yourself?
I'm on Movie Studio 11, not Pro, but I've been mixing very large pan/scan stills with AVCHD video input since Version 9. My output is always 1920x1080. I have had no problems with out of memory crashes or hangups with VMS 11 (or 10) but I do have the 64-bit fix installed and 6 GB RAM. Most of my stills are 4 - 5 MB JPG files but some (panoramas) are 20 MB or so.
Eugenia has said large still images can be a problem for Vegas (Pro I believe) and she recommends down-rezzing them, but this has not been my experience and I don't change the image's native size or resolution .
thanks again guys..... feel more confident just doing it rather than fretting about what might / might not work....
@mv - bit of both found original film strips on net and reworked them to my requirements.
you want a copy? if so i'll dropbox it as psd.... btw. reworked another version to 16:9 which is the one i'll probably end up using.