ekta-clone wrote:If avarage super8 image has 600-700 lines (which I don't doubt) , it takes a lot more resolution to transfer it to video.
yeah, you definitely need some oversampling.. but you should distinguish between scanning sensor and storage format. for example:
- the cinealta has a 1920x1080px sensor, stores it on a 1440x1080px codec, and gets about 1200x950 lines resolution.
- the canon HDV has a 1440x1080 sensor, stores it in a 1440x1080 codec, and resolves about 800 lines
- the sony HDV has a 960x1080 sensor stores it on a 1440x1080 codec, and resolves about 700x750 lines.
so you dont need twice the amount of pixels because todays image sensors use pretty clever algorithms
if we're strictly speaking resolution, i think 720p HD would hold up the full super8 resolution, but since we're using consumer grade cameras with average lenses, interpolated sensors, and compressed codecs etc, starting off with 1080i is maybe not a bad idea.
so, a very high quality HDV workprinter transfer could look like this:
- capture single frames at 1080i (1440x1080 pixels with 1.33 aspect), (if you really want to max it, use the analog/HD-SDI output and an uncompressed capture card)
- color correct
- decide what's going to be your high def master (and ask yourself, how do you play back HD anyway?).. then resize and crop to that size (i'd probably use a 960x720 pixel quicktime file with photo jpeg codec, or a 720p24 DVCPRO HD file).
- downconvert to PAL/NTSC, apply pulldown etc.
oh well, sorry for all the numbers.. obviously if you start to operate at this levels you should have a fairly good understanding of batch processing workflows. ;)
++ christoph ++