Autodesk 64006-051108-9001 User Guide - Page 216

Frame Size Indicator

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208 Chapter 8: Encoding Note: With streaming codecs, especially Sorenson Video, Dynamic Preview usually displays lower-quality results than the actual encoding because it does not take advantage of temporal encoding. However, this technique does display any color shifts accurately. Using the proper filters and adjustments can vastly improve the final image quality of the project. To see how processing improves compression: 1. Click the check box next to Encode on the left to enable it. 2. Click the check boxes next to Process and Encode on the right to enable them. 3. Click Update or press a D. This enables you to see how pre-processing the image prior to encoding improves the image quality compared to simply encoding the original source without processing it. To determine the trade-off between optimizing file size while impacting image quality, follow the instructions given next. To optimize file size and judge the resulting image quality: 1. Click the check boxes for Process and Encode on one side of the dialog and leave both disabled on the other side. 2. In the Settings window > Encode tab, adjust the spatial quality slider. 3. Click Update or press a D to generate new previews and see the results. Dynamic Preview accurately renders still image previews. 4. Use the frame size indicator to check the frame size. (See the section that follows for more information on the frame size indicator.) 5. Use the A/B slider to see the image degradation between the original and compressed images. 6. Continue adjusting the quality slider and generating the preview until you find the optimal trade-off between file size and quality. Frame Size Indicator Under the window, two file sizes appear. The original size is on the left, and the encoded size with the settings applied is on the right. When working with movies, if the Encode option is enabled, the size indicated is an approximation of the final size of that particular movie frame when encoded. For still images, this number is the exact size of the final file. Because the frame displayed in the Dynamic Preview window is a keyframe, the size indicated might not be the exact size of that frame in the final movie. Use the frame size indicator as a guide. To determine the exact size of a frame, encode the movie and use the information in the data rate graph in the Output window.

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Chapter 8: Encoding
208
Note:
With streaming codecs, especially Sorenson Video, Dynamic Preview usually displays
lower-quality results than the actual encoding because it does not take advantage of
temporal encoding. However, this technique does display any color shifts accurately.
Using the proper filters and adjustments can vastly improve the final image quality of the
project.
To see how processing improves compression:
1.
Click the check box next to Encode on the left to enable it.
2.
Click the check boxes next to Process and Encode on the right to enable them.
3.
Click Update or press
D.
This enables you to see how pre-processing the image prior to encoding improves the image
quality compared to simply encoding the original source without processing it.
To determine the trade-off between optimizing file size while impacting image quality,
follow the instructions given next.
To optimize file size and judge the resulting image quality:
1.
Click the check boxes for Process and Encode on one side of the dialog and leave both
disabled on the other side.
2.
In the Settings window > Encode tab, adjust the spatial quality slider.
3.
Click Update or press
D to generate new previews and see the results.
Dynamic Preview accurately renders still image previews.
4.
Use the frame size indicator to check the frame size. (See the section that follows for more
information on the frame size indicator.)
5.
Use the A/B slider to see the image degradation between the original and compressed
images.
6.
Continue adjusting the quality slider and generating the preview until you find the optimal
trade-off between file size and quality.
Frame Size Indicator
Under the window, two file sizes appear. The original size is on the left, and the encoded size
with the settings applied is on the right. When working with movies, if the Encode option is
enabled, the size indicated is an approximation of the final size of that particular movie frame
when encoded. For still images, this number is the exact size of the final file.
Because the frame displayed in the Dynamic Preview window is a keyframe, the size indicated
might not be the exact size of that frame in the final movie. Use the frame size indicator as a
guide. To determine the exact size of a frame, encode the movie and use the information in the
data rate graph in the Output window.