I am currently putting together a video segment of an afternoon's walk of several kilometres (or 'miles', if that's what you 'do' in your neck-of-the-woods). Each portion of the overall sequence of about twelve minutes duration, is introduced by a widish-angle 'panoramic' shot taken from a tripod, which shows the track to be traversed, clearly. The intention, (and it's well on the way to fulfilment, since everything 'works'), is to animate an ever-extending white-line from end to end of the walked-over landscape-shot in full-screen, indicating progress and at any one time, and, optionally, to run the corresponding video shots in a reduced-size window. The technology is perfected, and the line travels, ever-extending as the corresponding, directly-obtained shots keep pace in the smaller 'window'. Being able to run the smaller window allows me to intermix 1920 x 1080 and 720 x 576 shots without the latter appearing to be at a disadvantage. The whole effect is created by laying-out on a photograph, the same size as the finished images, the line to be traversed in 'chroma'-compatible green, which has been lightened slightly in tone, so as to be 'visible' against the true 'chroma' green of the typical green-screen process. Both greens have been selected so as to 'disappear' when the 'chroma' function is invoked. That is then selected, and 'lifted' by means of 'copy', and plonked onto a blank 'green-screen' of 1920 x 1080 pixels. It's merely then, a matter of tracing the final 'white-line', frame by frame onto the green blank, using the 'pilot' slightly-lighter line as a guide and extending the line in even steps. It works brilliantly, but for one thing. My beautiful crisp tidy 'lines' once saved as 'frames' (one to each 'step') and brought back to the screen again, at rendering-time, have pixellated badly at the edges and no-longer stand-out against the background as they were first drawn. On projection, the lovely crisp and accurate line has gone muddy, due to the numbers of pixel which are now, neither green, nor white, but somewhere in-between, and with a line only four pixels wide, that means, effectively, the entire line.
My question, then, is this: Is it possible to save this material as a series of 'unmerged' images so that the outlines remain crisp, clear and well-defined? Has anyone 'out-there' had to overcome this problem and is able to point me in the right direction? All suggestions welcome.
Dunedin - New Zealand