It does not know whether or not the analog levels are correct. One option is to purchase a digital-analog converter that is known to convert levels correctly.
But if you do not want to risk your footage to faith, then use an analog waveform monitor! A proc amp is typically a hardware device that adjusts analog levels.
One of these can be used to convert black level from 0 IRE to 7. You will need to adjust the video levels as follows:. When calibrating a monitor to color bars, be aware that the calibration may not necessarily be correct for all sources connected to the monitor.
It may be that some sources have black level at 7. Because of this reason, you should avoid DVD-based calibration discs i.
Avia, Joe Kane to calibrate monitors attached to editing systems unless both your DVD player and analog-digital convertor convert levels in the same manner. There are many other potential sources of problems, such as the different color ranges used for computer RGB graphics versus Not all levels problems are due to 7.
To keep things in perspective, an incorrect black level is not necessarily very noticeable or always harmful to the image. The fact this problem is so prevalent indicates that there is not that much concern about it. Nevertheless, it should hardly be an excuse for doing things the wrong way!
If you spot any inaccuracies or have any comments, please feel free to email me at glennchan AT gmail. Telecine Internet Group mailing list posting. This site by Glenn Chan. My plugins: Photoshop color correction Photoshop noise reduction Freeware. The 7. Correct Incorrect On the internet, there is a lot of confusion concerning "7.
The problem can be seperated into the following issues: Not all equipment follows engineering standards. Yes, 7. Only SD and only in analog. In serial component it is zero, and the gear that converts to analog converts to 7. You have this choice in your Avid and most SD digital decks to make that setting zero used in Japan. When setup is added by gear, are the shadows, mids and highlights all affected by the same amount? For example, if I increase Brightness in the CC Toolset, all values are made brighter by the same amount the entire waveform just moves up.
But if I increase Setup in the CC Toolset, the shadows are increased the most and the mids are increased less and the shadows hardly at all the bottom of the waveform moves up the most.
A carefully manipulated combination of set up and gamma adjustments - particularly gamma, because unlike the other adjustments, gamma adjusts the overall linearity of the waveform without changing the set up floor or the gain ceiling. It adjusts the midtones, and is a great way to boost up the details without over peaking them.
Also gives you more color space to work with when trying to correct for severe over-exposures. Filtered by:. Previous template Next. We never shoot for Japan. Tags: None. There is no setup in digital recording. Read that as setup is always 0. But actual real-world experience trumps theory. May be variations in how VCRs pro vs. If all you have is a VHS deck and a Canopus capture box, what is the recommended way to get the Luma range right?
In adddition, is it possible that if you capture analog with the wrong black level, that you can correct this using Vegas 4, for example? Sounds reasonabale to me. Download one and play it back through the Canopus to see how if?
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