Snapshot problem?
FadeToBlack
wrote on 11/3/2002, 4:21 PM
Comments
Tyler.Durden
wrote on 11/3/2002, 9:10 PM
Hi Gary,
I can't replicate what you're seeing. Tried it a few times a few ways.
No black line in Vegas or Pshop.
Best Quality
Project Full-Size
Vegas Captured footage from SOny D-8
Progressive or Interlaced Project
Saved or copied snapshot
Tried it with generated media too
All looked fine.
Is your field order properly set in media props? Sounds like a field-line showing up.
Got any other media? Video from another camera?
Regards, MPH
I can't replicate what you're seeing. Tried it a few times a few ways.
No black line in Vegas or Pshop.
Best Quality
Project Full-Size
Vegas Captured footage from SOny D-8
Progressive or Interlaced Project
Saved or copied snapshot
Tried it with generated media too
All looked fine.
Is your field order properly set in media props? Sounds like a field-line showing up.
Got any other media? Video from another camera?
Regards, MPH
Chienworks
wrote on 11/3/2002, 9:45 PM
I was going to guess that maybe GG's camera is filling out a full 240 lines on the lower field, but maybe only 239 on the upper. It would look fine in preview, but when summing the two fields to get a still it might have trouble with a blank bottom line. Just a guess though.
FadeToBlack
wrote on 11/4/2002, 12:13 AM
SonyDennis
wrote on 11/11/2002, 9:19 AM
GG:
Many cameras have various artifacts at various edges. I've seen different color lines at the top and bottom, and black bars on the left/right. The top/bottom lines vary depending on the mode the camera was in (field vs. frame, normal vs. reduced light mode) and are artifacts of the algorithms they use to convert CCD levels to DV pixel levels (there's lots of strange and fun math going on there!). The left/right bars are an analog throwback to 601 days where you weren't allowed full range signal throws from white to black, and "outside" of the image was "black", so they ramped the values to black at the edges. Or, in consumer cameras, they just don't have CCD elements out that far (or the electronic image stabilization stole them).
It may sound trite, but my best advice to you is to IGNORE them. They will be in the overscan area of the TV anyway. Even if the video is projected, a black line at the top/bottom won't be seen ('cause it's black).
They are obvious on the computer because the video has a "frame" around it, which makes the black line stand out. Due mainly to these artifacts, and because broadcasters don't put anything interesting in the outside of the frame anyway (also, due to overscan on TVs), when I output to a streaming format, I use pan/crop (or track motion, backwards) to zoom the video up a little so the edges are clean.
///d@
Many cameras have various artifacts at various edges. I've seen different color lines at the top and bottom, and black bars on the left/right. The top/bottom lines vary depending on the mode the camera was in (field vs. frame, normal vs. reduced light mode) and are artifacts of the algorithms they use to convert CCD levels to DV pixel levels (there's lots of strange and fun math going on there!). The left/right bars are an analog throwback to 601 days where you weren't allowed full range signal throws from white to black, and "outside" of the image was "black", so they ramped the values to black at the edges. Or, in consumer cameras, they just don't have CCD elements out that far (or the electronic image stabilization stole them).
It may sound trite, but my best advice to you is to IGNORE them. They will be in the overscan area of the TV anyway. Even if the video is projected, a black line at the top/bottom won't be seen ('cause it's black).
They are obvious on the computer because the video has a "frame" around it, which makes the black line stand out. Due mainly to these artifacts, and because broadcasters don't put anything interesting in the outside of the frame anyway (also, due to overscan on TVs), when I output to a streaming format, I use pan/crop (or track motion, backwards) to zoom the video up a little so the edges are clean.
///d@