Adobe Premiere Pro CC v.7.xx - Manual (Page 161)

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Replace low-resolution clips with high-resolution clips for online editing
You can replace low-resolution copies of assets with the original high-resolution so that you can render a project at full resolution.
1. Select Clip > Replace Footage. Browse to the original high-resolution clip that has the same filename as the low-resolution clip you
selected, and select it. Click Select.
2. Repeat the previous two steps for each low-resolution clip used in the project.
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