Classroom in a book
LESSON 18 Exploring Adobe OnLocation CS5 4
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LESSON 18 Exploring Adobe OnLocation CS5 4 Select the clip named light_quiet.mov. When you play this clip, notice that the waveform is pushed to the top, with lots of pixels above 100 IRE and none near 7.5 IRE. This means that the detail in the brightest pixels will be lost and that the video will appear faded. This is another case where adjusting the lighting or camera exposure would make a much nicer image. Although the Waveform Monitor is helpful for analyzing brightness, the Vectorscope is useful for analyzing color. The Vectorscope is a round graph with “no color” represented in the center and a high value of color represented on the outer edge. The color wheel is represented in quadrants around the circle of the Vectorscope. Starting at 11 o’clock and going clockwise are Red, Magenta, Blue, Cyan, Green, and Yellow. The farther the graph extends to the edge, the higher the saturation of that color. In addition, the line between red and yellow represents flesh tones, and the posi- tioning of the pixels along that line tells us that the face tones, which comprise the bulk of the saturated pixels in this shot, are accurately white balanced. Looking at the waveform, you can tell that there aren’t a lot of saturated colors in the frame (it is shot in a medieval tower, after all) but that facial colors appear accurate. ptg ADOBE PREMIERE PRO CS5 CLASSROOM IN A BOOK 331 So far we have been focusing on Adobe OnLocation’s video capabilities. But audio is half of any good production, so let’s take a look at one of the audio tools included with Adobe OnLocation: the Audio Meter. 1 Play the clip named normal.mov, and observe the levels represented by the green/yellow lines in the meter. Since this is a stereo clip, you can see the left and right channels represented as it plays. Notice that there are good levels across most of the frequency range, indicated by green and some yellow high points in the audio. This is an example of a good audio file. The meter did not peak (turn red) as you played this file. The overall volume is good and it’s not too loud. 2 Play the clip named dark_loud.mov. Notice this clip peaks, or clips , on the meter, as shown indicated by the red bars. This audio is too loud at some points, which causes clipping and makes the loud sections sound very flat. In this case, you should turn down the audio to the camera or reposition the microphone. 3 Play the clip named light_quiet.mov. Notice the overall level or volume is too low. This is represented visually by displaying only green levels, never peaking into yellow. This would be difficult to correct in postproduction. It is much easier to fix the problem at the scene when detected with the Audio Meter. Using these video- and audio-monitoring tools can save you hours in postproduc- tion trying to correct problems. Adobe OnLocation can be a real time-saver in preventing problems and helping you produce high-quality video and audio. Many producers shoot with cameras not tethered to the computer via IEEE 1394 connections. Although you can’t capture video from these devices directly to disk, you can create shot lists with placeholders for each shot and capture metadata about the clips to these placeholders before, during, and after the shoot. Then you Volume good Volume too loud Volume too low ptg 332 LESSON 18 Exploring Adobe OnLocation CS5 can link the actual video files to the placeholders. Linking can be either manual or automatic; here’s the workflow for automatically linking placeholders with clips: Yüklə 22,61 Mb. Dostları ilə paylaş:
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