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You are here: User Guide > Nuke > Previews and Rendering > Previewing in a Nuke Viewer

Previewing in a Nuke Viewer

When you connect a Viewer to a given node’s output (by selecting the node and pressing a number key), Nuke immediately starts rendering the output in the Viewer using all available local processors.

Keep in mind the following tips in order to speed up this type of preview rendering:

• First, if you don’t need to evaluate the whole image, zoom into the area of interest (see Panning and Zooming the Viewer Window in the Getting Started Guide for more information). Nuke then renders only the portion of scan lines visible within the Viewer.

• Alternatively, you can use the Viewer’s region of interest (ROI) feature to render only a portion of the image, while seeing that result in the context of the whole image.

To Enable the ROI Render Feature

1.   Press Alt+W over the Viewer. The Viewer’s ROI button turns red , indicating that the feature is enabled.
2.   Drag on the Viewer to draw the region of interest. The Viewer now renders only the pixels within the region.

To Edit the Position or Size of Current ROI

1.   Click the ROI button so that it turns red . The overlay for the current ROI appears in the Viewer.
2.   To reposition the ROI:

Using the crosshair in the middle of the ROI, drag the ROI to the desired location.

3.   To resize the ROI:

Drag any corner or side of the ROI until you achieve the desired size.

To Disable the ROI Render Feature

Click the Viewer’s ROI button. It turns gray , signaling that it is off. The Viewer now renders all of the visible image.