Using the LUT Graph

Using the LUT Graph

The Y-axis of the graph (the output axis) is the number of color levels set by the Output Color Depth list. For example, 10-bit produces 210 levels, so the range goes from 0 to 1023.

Note: Float uses Y-axis values from 0 to 1 to represent the many color levels that result from using a floating point number to represent each color value.

The X-axis of the graph (the input axis) is the number of color levels set for the image stream. For example, if a layer does not have a Bit Depth Converter operator on it, this number is taken from bit depth of the Footage operator for the layer.

Graph Buttons

The Red, Green, and Blue buttons let you work on the settings of a color individually. There are four buttons beside the graph:

RGB—works on all three channels

Red—works on the Red curve only

Green—works on the Green curve only

Blue—works on the Blue curve only

Note: The Lock button does not affect your work on an individual channel.

Graph Gadgets

You can use the curve gadgets to adjust the fields and vice versa. To use the gadgets, you drag the dashed lines and the curve itself.

For Straight and Log to Linear:

Reference White—the right gadget

Reference Black—the left gadget

Highlight—the top gadget

Shadow—the bottom gadget

Gamma Correction—the curve gadget

For Linear to Log:

Reference White—the top gadget

Reference Black—the bottom gadget

Highlight—the right gadget

Shadow—the left gadget

Gamma Correction—the curve gadget

To work with the graph:
Do any of the following:

To zoom the graph, Ctrl-drag (Windows) or Command-drag (Macintosh).

To pan the graph, Alt-drag (Windows) or Option-drag (Macintosh).

To magnify the histogram, adjust the Zoom field.

Note: The Reset button resets more than the curves: The Use LUT button is disabled and the other panel (Output or Settings) appears. The bit depth is reset to that of the footage or the input stream to the Bit Depth Converter operator.