peak white contrast calibration

MoBetta wrote on 8/7/2003, 6:41 PM

I am submitting a doc. Film at a festival and one of the production requirements is “ Maximum 105% IRE clipped peak whites”, referring to contrast calibration… I assume I’ ve searched the data base and the help file in V.V. to see if there is anything, but can’t find anything. Can anyone give some kind of direction??

Thanks

MoBetta

Comments

BillyBoy wrote on 8/7/2003, 6:56 PM

You can use the scopes feature in Vegas 4. Bring up Luminance waveform in the preview window. Observe to go no higher than a little past the 100 line as you adjust gain and gamma in the Color Corrector as you watch your video play. You can also use the broadcast clamping filter and set IRE values directly.

The first method gives you greater range and control. All the second does is restrict how high/low levels can get. If you try the second, observe the effect on the histogram as your video plays. Note the changeswith and without (turning filter on and off) seeing peaks at both extremes clipped from the waveform depending on how you adjust the filter. The first method does the same and is much more sensentive allowing very fine adjustments with key frames.