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Display Area
The Kurves display area contains the curves for each channel; histograms of the channel values Y, R, G, B for the input or output image, as controlled by H In and H Out; and two range markers, one along the horizontal (X, input) axis, and one along the vertical (Y, output) axis.
At any time, one curve is on top of the other channels, with a wider line. Right-click a curve to bring it on top, or right-click its Show button.
You can left-drag the control points of any curve.
Left click and drag on a curve to add a control point then continue to drag its position.
Double-left-click a control point to change it from a smooth to a corner point or back.
Control points are keyed at frame zero by default, effectively not animated; turn on Make Keys
to begin animating their positions.
Right-click a control point to remove a key on the current frame; if it is not animated or is the last key, the control point will be deleted.
Shift-right-click a control point to immediately delete it.
The blue range markers indicate the position of the “1.0” value on the respective axis. Drag the 1.0 range marker left or down to indirectly control the maximum floating- point channel value that Kurves will modify. You can see that range on the tooltip for the marker. Most commonly, drag the horizontal one left to handle overrange floating point values, while keeping the output range at 1.0.
If the range marker turns red, there are input values exceeding the current maximum present in the input. (This will only happen with floating-point images and when H In is selected.) Right-click and click Auto-set max input to set the marker to the largest input value. If the maximum is very rare, you may want to decrease the maximum intentionally; there is no problem having overrange values or a red marker.
If underrange values (ie less than zero) are present, then a red dot will appear at lower left of the graph origin:
Underrange values are clipped to zero at present; some codecs may create small negative values inadvertently. (The framework can support specified minimum values as well, though we don’t currently provide a user interface for.)
The histogram curves cannot be clicked by the user in the view. Use the H In and H Out buttons and the right-click menu to control them.
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