Sampler

This node converts a horizontal scanline of pixel data into a lookup curve. The Viewer sampler widget or sampler y coordinate selects the scanline (sampler x is ignored).

The Sampler node can be useful for visualizing the effects of color corrections on the image.

Inputs and Controls

Connection Type	Connection Name	Function
Input	unnamed	The image sequence from which the sample is taken.

Control (UI)	Knob (Scripting)	Default Value	Function
Sampler Tab
channels	channels	rgb	Loo kup curves are only generated for these channels. If you set this to something other than all or none, you can use the checkboxes on the right to select individual channels.
sampler xy	sampler	0, 0	Sets the position of the sampler widget that determines the scanline to convert into a lookup curve. Note: The sampler x coordinate is ignored.
normalize x	normalize_x	enabled	When enabled, the lookup curves are normalized.
Sample current frame	sample_current	N/A	Click to sample the current frame and update the lookup curve output for the current sampler point.
[lookup curves]	lut	N/A	Displays the scanline specified by the sampler y coordinate as lookup curves. You can also view individual pixel values by mousing over the Viewer.