#Field rendering
30-Jul-94 18:34:00
Sb: #114925-#Field rendering
Fm: MARTIN G FOSTER 70303,456
To: WIM LAMOTTE 100101,1014
Wim,
I'm aware of this issue, but it's not really a bug. It's been that way since r2
– it's just the way it is. Anyway, for the least work, I'd just rerender the
reversed portion of the frames. But, I've figured out a fix which may be too
late, but I'll let you know anyway.
You'd use video post to reverse the field order by using a alpha matte of
alternating, 1 pixel high, horizontal black/white lines (easy to create in
animator pro). If you had a 486 line .tga file create 243 pure white (rgb
255,255,255) lines interlaced with 243 black lines (rgb 0,0,0). If using PAL it
would be 576 lines (288 white/288 black). For example:
wwwwwwwww
bbbbbbbbb
wwwwwwwww
bbbbbbbbb
where w=white, b=black and the lines extend the full width (756,720,512 etc,
whatever your .tga file width is). Save the file as filter.gif, or similar.
In video post you'd have 2 entries using .ifl file lists of the offending
frames. The first 1 would need an offset of Y=-1; the second entry would need
Y=1. The first entry's alpha column would be RGB Mask (use filter.gif),
Intensity ON, Blur edges OFF, negative OFF; the second would be the same with
negative ON (to work on the other set of lines). Render and save the files
under another name.
I haven't tested this theory, but it should work, and would be much quicker
than re-rendering a heavy-duty sequence the normal way.
>> but this gives a visible shift at the "border frame" between the normal
sequence and the reversed sequence. <<
This shouldn't happen if the above method works.
Martin