Sets the first and last frame in the playback range. You can enter frame numbers here or Cmd+drag the red triangles in the timeline.

Click to unlock or lock playback to the frame numbers specified in frame_range.

Sets the number of frames to step through using the Viewer << and >> buttons.

Sets the channels to display in the viewer.

You can also select a channel from a different layer to display in the alpha channel.

When set to exposure, any pixels that are outside the 0-1 range are Zebra-striped in the Viewer.

Sets the amount of gain to multiply the image by before display.

Sets the amount of gamma correction to apply to the image.

Gamma correction is applied after the gain, viewerprocess, and any custom inputprocess.

When enabled, the LUT is applied to color channels only.

Sets the amount of down scaling applied before display. factor to speed up rendering.

You can use downrez to speed up rendering, but bear in mind that it is multiplied into any global proxy scale that may also be in effect.

When enabled, output to the Viewer ignores the file’s pixel aspect ratio and always draws using square pixels.

When enabled, the Viewer is prevented from automatically adjusting the zoom level to fit new images into the Viewer when swapping between different sized images.

When enabled, any overscan present is displayed in the Viewer.

When enabled, force Nuke to render every scanline in the image. Compared to the default mode, this may take slightly longer initially and requires more space in the Viewer cache, but once Nuke has cached the frames you require, you can pan around and change the zoom level without breaking the cache or affecting playback.

Sets the amount of overscan to show in the Viewer when show overscan ins enabled.

Sets the safe zone overlay to apply to the image:

• no guides

• title safe

• action safe

• format center

When enabled, the center of the format is marked with a cross in the Viewer.

Sets the aspect ratio of the mask specified in the mask mode dropdown.

Sets the mask overlay to apply to the image:

• no mask

• lines

• half

• full

Sets the f-stop to display when gain is set to 1. You can use zero to show stops as +/-n.

Note:  If you want a non-integer value, enter a formula to get an accurate value, otherwise the display does not round to normal f-stop names. For instance, instead of 5.6 you would use pow(2,2.5) to get 5.65685

Sets the camera shutter angle from 0-360 degrees.

This is used in combination with the Viewer's playback fps setting to compute exposure values.

Sets the OpenGL buffer depth and enables the use of the GPU for the Viewer process and input process:

• byte - converts to 8-bit with error diffusion.

• half-float - converts to 16-bit (half) float.

• float - uses a full 32-bit floating point texture (may be very slow on some cards).

In half and full float modes, the GPU can be used to apply Viewer effects like gamma and the LUT in a Viewer process.

Note:  You can choose a default value for this setting in the Preferences or by using knobDefault() in a startup script.

When enabled, Viewer effects (like gain, gamma, and viewer process node) are applied using the GPU when possible.

The ’when possible’ clause is due to the fact that in some cases, like when the GL buffer depth is 8-bit, effects must be computed in the CPU.

When enabled, compute nodes connected to the Viewer input on the GPU when possible, though not all nodes have a GPU implementation.

When enabled, GPU dithering is allowed in the Viewer (which affects half-float and float modes).

Sets the frequency of dithering applied to GPU enabled compositing Viewers, so that you can be sure you're working in a consistent environment:

• high frequency - the default setting, applies a high frequency dithering algorithm in screen space, after any viewer rescaling is applied. As you pan and zoom the Viewer, dithered pixels remain the same scale.

• low frequency - applies a low frequency dithering algorithm in image space, before any viewer rescaling is applied. As you zoom in the Viewer, dithered pixels get bigger.

• no dithering - disables GPU dithering.

Note:  When the Viewer AB mode is changed to wipe or stack, the state of the GPU acceleration controls is stored, GPU acceleration is turned off, and GPU acceleration is disabled.

When the Viewer AB mode is changed back to default, GPU acceleration is re-enabled and the state of the GPU acceleration controls is restored.

Sets the Viewer Process operation applied to the viewed image before it is displayed on the screen. It is typically used to convert from linear to your monitor's colorspace.

Note:  The control label has been updated, but the knob name currently remains the same. The knob name will also change in a future release.

You can add your own processes to the dropdown using the Python nuke.ViewerProcess.register() function. See Creating Custom Viewer Processes for more information.

Sets the name of a node to process through for viewing when the IP button is activated. If the node does not exist, the IP button has no effect.

Applies the input process node before displaying the image.

To define the node to use, enter its name in the input process field or, from the Node Graph right-click menu, select Edit > Node > Use as Input Process.

Sets when the input process node specified is applied:

• before viewer process.

• after viewer process.

Sets the selection mode for the current Viewer:

• rectangle selection

• ellipse selection

• lasso selection

Sets the transform space to use in the Viewer:

• object - transforms in this space are relative to the object itself and its orientation. For example, translating on the X axis in object space might shift its position on the Z axis in world space.

• screen - transforms in this space are relative to the screen, the flat plane of your monitor, and its orientation. You can only translate on the X and Y axes, the Z axis is disabled.

• world - transforms in this space are defined by the XYZ axes of the scene in Nuke's 3D Viewer. The mini axes drawn at the bottom left of the Viewer always show world space no matter what space you're working in.

Currently, only one Hydra delegate is available in Nuke, the GL renderer, which handles the USD-based geometry. Classic 3D system geometry is still drawn with Nuke's classic renderer, regardless of which Hydra render delegate you choose.

In future releases, more render delegates will be made available.

Enable or disable lights, materials, shadows, and progressive rendering in the 3D Viewer, depending on which 3D system you're using.

Controls whether objects with a Purpose assigned in the new 3D system are visible or not.

Note:  Objects with Purpose set to default are always visible in the scene.

Sets the level of refinement on subdivided prims in the new 3D system. Higher values produce better visual results, but at the cost of performance.

Note:  The Refine Level only affects the Viewer output, not the final rendered scene.

Sets the position of the grid in the 3D Viewer on the x, y, and z axes.

Adjust the display characteristics of 3D objects. These settings don’t affect the render output of the scene; these are for display purposes only in the 3D Viewer.

• off - hides all 3D objects.

• wireframe - displays only the outlines of object geometry.

• solid - displays all object geometry with a solid color.

• solid+lines - displays the geometry as solid color with individual object’s geometry outlines.

• textured - displays only the surface texture of objects.

• textured+lines - displays the wireframe plus the surface texture.

• unchanged - doesn't change object display modes.

Note:  This setting can override individual object settings.

When enabled, objects appear transparent where their alpha is < 1.

When enabled, objects are shaded with a spotlight attached to the viewpoint to make their shape visible.

Sets the alpha value used by the transparency control which determines if an object is opaque or not.

Sets the visibility of lines in hidden-line mode.

When enabled, all points are displayed in the 3D Viewer.

When enabled, all points are numbered in the 3D Viewer.

When enabled, all points are labeled with xyz coordinates in the 3D Viewer.

When enabled, all available point normals are displayed in the 3D Viewer.

When enabled, all available point uvs are displayed in the 3D Viewer.

When enabled, all vertices are labeled in the 3D Viewer.

When enabled, all available vertex normals are displayed in the 3D Viewer.

When enabled, all available vertex uvs are displayed in the 3D Viewer.

When enabled, all primitives are labeled in the 3D Viewer.

When enabled, all primitive normals are labeled in the 3D Viewer.

When enabled, all primitive bounding boxes are labeled in the 3D Viewer.

When enabled, a grid displays in the 3D Viewer.

Sets the default lens (focal length divided by film width) to use in 3D mode when no camera is selected.

Sets the limit of the OpenGL near clipping plane. Objects closer to the camera that this value are not rendered the 3D Viewer.

Sets the limit of the OpenGL far clipping plane. Objects farther away from the camera that this value are not rendered the 3D Viewer.

The far clipping plane can be moved farther away if objects in the scene are farther away. In this case, the near plane is also moved so that the ratio between near and far planes is preserved.

Sets the order in which skew operations are applied.

• XY - Skew on the X axis is applied before skew on the Y axis.

• YX - Skew on the Y axis is applied before skew on the X axis.

Soft Selection

When enabled, soft selection is applied to any selection made in the Viewer.

When disabled, selections are made in the same way as legacy versions of Nuke.

Controls the radius of the selection falloff added to the initial selection. Increasing the value includes selections from farther away from the initial points or faces.

Sets the curve used to describe falloff farther away from the initial points or faces.

Adjusts the preset curve selected in the left-hand panel. You can also add your own curve to control falloff using the + button.

Adding a custom curve adds it to the Falloff Curve dropdown.

When enabled, the Viewer output is sent to a floating window, NDI session, or monitor out device, such as AJA or Blackmagic Design card. The type of output is specified using the Device dropdown.

Sets the Viewer output destination:

• Floating Window - Nuke's native monitor out uses a floating monitor and does not require additional hardware.

• NDI - A network protocol that enables video, and metadata signals to be sent over standard IP networks in real-time. This option allows you to easily share a stream of the Viewer output with anyone else on the network.

Note:  To view the NDI stream, you need the NDI Monitor application installed. See Streaming Viewer Output Over the Internet with NDI® for more information.

• Dedicated Monitor Out Card - Nuke supports various AJA and Blackmagic devices that can be selected from the Device dropdown after installation.

When enabled, minimizing Nuke also minimizes the Floating Window monitor out feed.

When disabled, minimizing Nuke has no effect on the Floating Window.

Note:  This control is only displayed when Device is set to Floating Window.

Input Setup

Select the view mode using the AB Mode dropdown:

• Active Buffer - the monitor always shows the output from the buffer currently in use by the selected Viewer.

• Buffer A - the monitor always shows the output from the selected Viewer buffer A.

• Buffer B - the monitor always shows the output from the selected Viewer buffer B.

• Interactive - the monitor shows the output from the selected Viewer including the A/B player mode currently in use, such as wipe.

Input Process

Enable Use Input Process to apply an input process node before displaying the image on the external monitor or floating window. This allows you to display different color information in Nuke's Viewer and monitor or floating window.

To define the node to use, enter its name in the Viewer node's input process field or, from the Node Graph right-click menu, select Edit > Node > Use as Input Process.

Output Setup

Select the resolution output from the monitor card currently in use. The resolutions available depend on the card manufacturer.

Note:  Floating monitor out always uses the resolution of the Viewer in use.

Select the pixel format output from the monitor card currently in use. The formats available depend on the card manufacturer.

Enable Use Viewer Gamma and Gain to apply the active Viewer’s filtering, gamma, and gain to the monitor out.

Enable Vertical Flip to flip the output vertically. This control is handy if you're using a ceiling mounted projector.

Enable Horizontal Flip to flop the output horizontally.

Select the color transform to apply to the image. If you’ve specified an OCIO configuration file in the preferences, these custom LUTs are also applicable.

Sets the color gamut sent as part of HDR metadata signals.