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Canon XL and GL Series DV Camcorders
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Old March 5th, 2005, 02:38 PM   #1
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XL2 vertical streaking

I haven't had a lot of time to play around with my camera, but recently I noticed that on reds and oranges, there are vertical streaks (for lack of a better word). The problem occurs every X number of pixels, meaning, the streaks are evenly spaced across the frame, and always occur at the same points. I test this by panning the camera left and the streaks reman stationary relative to the frame as the camera pans. Any ideas on what would be causing this? The problem is present in the raw video, but is also present in the rendered video after the 2:3:3:2 pulldown is removed. I'm using vegas and render the video to 24p fps.

I've included a link to the raw dv capture. The problem is most visible on the right edge of the orange blanket, but is also noticible across the top edge if you look close. I also shot a red flower moving in the wind yesterday that exibited this same problem. Any ideas? Any help will be very appreciated.

Here's the link to the video of the orange blanket: www.clemson.edu/~bowlesb/video/test1.avi (7.98MB)

Thanks!
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Old March 5th, 2005, 04:18 PM   #2
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You'll hear this from many others. The "streaking" you see on reds and oranges are from the poor color sampling in the 4:1:1 DV25 format.

I know what the easy solution is for this using Final Cut Pro, but not Vegas or Premiere. In Final Cut Pro, there's a plugin called "Color Smoothing - 4:1:1" that smooths out those blocky artifacts. Then make sure you render your final output to a better codec, like DV50 or Uncompressed. It will look worlds better.

Example of no color smoothing:
http://www.holyzoo.com/content/xl2/i..._Smoothing.png

Example with color smoothing:

http://www.holyzoo.com/content/xl2/i..._Smoothing.png



For Premiere, you can refer to this article:

www.neopics.com/bluescreen/
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Old March 5th, 2005, 10:16 PM   #3
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Steev,

I saw a post talking about the 4:1:1 sampling but I wasn't sure if this was the problem or not. I wasn't sure if there was something I was doing wrong with the camera. After reading your reply I tried Chroma Blur in Vegas and it helped a bunch. Thanks for the explination.

Does anyone else have a better suggestion than Chroma Blur to remove these artifacts from the footage using Vegas? Chroma Blur seems to work pretty good, but that really doesn't mean very much coming from me because I'm so new to the digital video world. I'll keep playing with the FX but any help will be appreciated.
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Old March 5th, 2005, 10:54 PM   #4
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Well, the main problem with MiniDv, is, it's MiniDV.

Man, I crack myself up.
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