| The Curve window shows a graph of the curve that is currently loaded.
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| Along the bottom of the graph is the input tonal range. This represents the intensity of the light at each pixel on the camera's sensor.
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| Up the side of the graph is the output tonal range. This represents the intensity of the pixels in the output image.
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| The standard 'curve' is a straight line. This means there is a direct linear mapping of input to output tones.
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| You can visually see the effect of a curve by selecting a point on the input (x) axis, tracing up until you hit the curve and then horizontally across to the output (y) axis.
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| Curves are made up of nodes, the simplest of which is a 2-node curve (the default curve). You can add nodes to the curve and drag them to control the shape. You are allowed a maximum of 18 nodes (20 including the 2 end points).
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| Tip : When creating a curve you should try to keep nodes evenly spaced. This will help keep the curve a regular shape and free of 'twists'. Twists are where the curve doubles back on itself and may produce unexpected results.
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Tonal Range "Levels" control
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| There are 2 red markers on both the input and output tonal range axis' that define the range of tones to be used. By default these are set to give the maximum range but you can adjust them by clicking on the tonal axis and dragging them to the desired position.
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| Tip: The curve window can be made to always be visible by right-clicking it and selecting "Always on top".
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| Gamma adjuster
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| The Gamma selection is used to set the gamma value of the current curve. It is adjusted using the small up/down arrows on the right hand side of the value or by typing in the absolute value required.
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| Apply Curve
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| The Apply Curve checkbox is used to switch the effect of the curve On or Off.
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| Curve Info
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| You can set information for each curve to help identify and descibe them. This is required when uploading curves to the online database
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