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To clear an image from a viewer, click in the viewer to make it active; a thin red highlight is displayed at the top of the active viewer. With the viewer active, press the ` (accent) key. This key is usually found to the left of the 1 key on U.S. keyboards. The fastest way to remove all the images from all the viewers is to make sure none of the viewers is the active panel, and then press the Tilde key.
You can also select the node that is currently showing in the viewer, and press the viewer number again (1 or 2 respectively) to clear the viewer.
Viewer Controls
A series of buttons and pop-up menus in the viewer’s title bar provides several quick ways of customizing the viewer display.
Controls in the viewer title bar
— Zoom menu: Lets you zoom in on the image in the viewer to get a closer look, or zoom out to get more room around the edges of the frame for rotoscoping or positioning different layers. Choose Fit to automatically fit the overall image to the available dimensions of the viewer.
— Split Wipe button and A/B Buffer menu: You can actually load two nodes into a single viewer using that viewer’s A/B buffers by choosing a buffer from the menu and loading a node into the viewer. Turning on the Split Wipe button (press Forward Slash) shows a split wipe between the two buffers, which can be dragged left or right via the handle of the onscreen control, or rotated by dragging anywhere on the dividing line on the onscreen control. Alternatively, you can switch
between each full-screen buffer to compare them (or to dismiss a split-screen) by pressing Comma (A buffer) and Period (B buffer).
— SubView type: (These aren’t available in 3D viewers.) Clicking the icon itself enables or disables the current “SubView” option you’ve selected, while using the menu lets you choose which SubView is enabled. This menu serves one of two purposes. When displaying ordinary 2D nodes, it lets you open up SubViews, which are viewer “accessories” within a little pane that can be used to evaluate images in different ways. These include an Image Navigator (for navigating when zoomed far into an image), Magnifier, 2D viewer (a mini-view of the image), 3D Histogram scope, Color Inspector, Histogram scope, Image Info tooltip, Metadata tooltip, Vectorscope, or Waveform scope. The Swap option (Shift-V) lets you switch what’s displayed in the viewer with what’s being displayed in the Accessory pane. When displaying 3D nodes, this button lets you have access to an additional mini 3D viewer.
— Node name: The name of the currently viewed node is displayed at the center of the viewer’s title bar.
— ROI controls: Clicking the icon itself enables or disables RoI (Region of Interest) limiting in the viewer, while using the menu lets you choose the region of the RoI. RoI lets you define the region of the viewer in which pixels actually need to be updated. When a node renders, it intersects
the current RoI with the current Domain of Definition (DoD) to determine what pixels should be affected. When enabled, you can position a rectangle to restrict rendering to a small region of the image, which can significantly speed up performance when you’re working on very high resolution
or complex compositions. Auto (the default) sets the region to whatever is visible at the current zoom/pan level in the viewer. Choosing Set lets you draw a custom region within the frame by dragging a rectangle that defaults to the size of the viewer, which is resizable by dragging the corners or sides of the onscreen control. Choosing Lock prevents changes from being made to the current RoI. Choosing Reset resets the RoI to the whole viewer.
— Color controls: Lets you choose which color and/or image channels to display in the viewer. Clicking the icon itself toggles between Color (RGB) and Alpha, the two most common things you want to see (pressing C or A also toggles between Color and Alpha). Opening the menu displays every possible channel that can be displayed for the currently viewed node, commonly
including RGB, Red, Green, Blue, and Alpha (available from the keyboard by pressing R, G, B, or A). For certain media and nodes, additional auxiliary channels are available to be viewed, including
Z-depth, Object ID, Material ID, XYZ Normals, and so on.
— Viewer LUT: Clicking the icon itself toggles LUT (LookUp Table) display on or off, while the menu lets you choose which of the many available color space conversions to apply to the viewer. The top options let you choose Fusion controls that can be customized via the Edit item at the top of this menu. The rest of this menu shows all LUTs installed in the LUT directory to use for viewing.
By default, when using DaVinci Resolve, the viewers in the Fusion page show you the image prior to any grading done in the Color page, since the Fusion page comes before the Color page in the DaVinci Resolve image processing pipeline. When you’re working on clips that have been converted to linear color space for compositing, it is desirable to composite and make adjustments to the image relative to a normalized version of the image that appears close to
what the final will be. Enabling the LUT display lets you do this as a preview, without permanently applying color adjustments to the image.
— Option menu: This menu contains various settings that pertain to the viewers in Fusion.
— Snap to Pixel: When drawing or adjusting a polyline mask or spline, the control points will snap to pixel locations.
— Show Controls: Toggles whatever onscreen controls are visible for the currently selected node.
— Region: Provides all the settings for the Region of Interest in the viewer.
— Smooth Resize: This option uses a smoother bilinear interpolated resizing method when zooming into an image in the viewer; otherwise, scaling uses the nearest neighbor method and shows noticeable aliasing artifacts. However, this is more useful when you zoom in at a pixel level since there is no interpolation.
— Show Square Pixels: Overrides the auto aspect correction when using formats with non-square pixels.
— Checker Underlay: Toggles a checkerboard underlay that makes it easy to see areas of transparency.
— Normalized Color Range: Allows for the visualization of brightness values outside of the normal viewing range, particularly when working with floating-point images or auxiliary channels.
— Gain/Gamma: Exposes a simple pair of Gain and Gamma sliders that let you adjust the viewer’s brightness.
— 360 View: Used to properly display spherical imagery in a variety of formats, selectable from this submenu.
— Stereo: Used to properly display stereoscopic imagery in a variety of formats, selectable from this submenu.