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Techniques for Independent Production
The challenges of creating Digital Cinema and other narrative forms.


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Old October 26th, 2005, 01:23 PM   #1
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Visible Pixel

when i use the color correction in a few situations, in the darkest points, the image decomposes in visible pixels.
.a problem of Dv
.a bad capture (codec)

Do you solve it?

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I edit with Final Cut Pro & Avid Xpress Pro
Color correction with After Effect (Color Finesse.....)
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Old October 26th, 2005, 01:52 PM   #2
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Maybe the color correction level is too much. As a newbie, even I had similar problems when I used to meddle with AVID EXPRESS color correcter.
Exporting frames while color correcting might give u a fair idea about how the result wud be. Hope that helps.

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Old October 26th, 2005, 02:05 PM   #3
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Manu,

This is a limitation of miniDV. Are you familiar with the miniDV colorspace, 4:1:1? It means the format records only 1/4 as much color information as it does lumanance information. This can make color correcting difficult. You can do a little bit, but push it too far and you'll start to see blocks.

You will get better color correction if you can add deartifacting to your workflow. Deartifacting restores some of the detail to the color channels, so you can get more accurate color correction. The new Magic Bullet for Editors 2 includes deartifacting, and there is a deartifacting plugin from Zenote (haven't tried it). Some NLEs, like FCP, have color smoothing, which is good, but not as good as a real deartifacter.

One note, when you deartifact, you will have to save to an uncompressed video format, like uncompressed AVI or QT, to retain the detail. Do you color correcting and editing in this format, then render out to MPEG-2 for DVD (assuming DVD is your delivery format).

Also, if you are going to be doing extreme color correction, you really need to watch the exposure setting while shooting your video. You must get the exposure correct. If you know you are going to do something with the highlight, underexpose a bit to give yourself more highlight detail to work with. If you are going to mess with the shadows, overexpose a bit to get more detail. You can't correct details that you don't capture in the first place.

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