Nuke provides scopes to help you evaluate your media. There are a number of global controls (Preferences > Panels > Scopes) that affect how the Scopes display information:
• black point - sets the black out of range warning level.
• white point - sets the white out of range warning level.
• luma/chroma encoding - sets the video standard to use when converting RGB to luma or chroma values in the scope displays, either REC601 or REC709.
• Include viewer color transforms - when enabled, scope data includes the applied Viewer color transforms (gain, gamma, and LUT). When disabled, scope data does not include the applied Viewer color transforms. This may slow down rendering, as it may require image calculation.
• Force full frame - When enabled, scopes display data for the full frame, regardless of what portion of that frame is displayed in the Viewer. When disabled, scopes only display data for the current area requested by the Viewer rather than the full frame.
To open a scope, navigate to Window > New Scope and select the required scope from the list.
The Histogram provides three color channel and luma channel information that describes the distribution of red, green, blue, and luma pixels throughout the current frame.
The Histogram graphs the number of pixels at each brightness level, and from left to right, the areas of the Histogram represent shadow, mid tones, and highlights.
TIP: You can pan the view area by holding Alt, or the middle mouse button, and dragging in the panel.
There are also Viewer and Channel selection controls on the Histogram tab:
• Viewer selection - if you have multiple Viewers open, use the dropdown menu to associate Histogram output to the required clip.
The default value, Active Viewer, automatically displays details on the last Viewer you selected.
• Channel selection - select the channels to output. The default setting displays RGB, but you can also view channels separately.
• Mode selection - select the mode to output. The default setting displays ganged RGB, but you can also view the channels separately.
• Current View - describes the view currently displayed in the scope, whether it's the A or B buffer and the view. The view defaults to main, unless main has been replaced in multi-view scripts or projects.
Depending on which Viewer tools and views you have active, you can have up to four scopes displayed at once.
For example, with two stereo Read nodes, one in each input buffer, and wipe and Side by Side active, the scopes display something like this:
The scopes feature global customizable guides to help you view your clips. Navigate to Preferences > Panels > Scopes and enter values between 0 and 1 for the Black and White points. Note that this also sets the values for the Waveform display.
The guides at the edges of the Histogram turn red to warn you when the distribution is out of range:
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