OCIOColorSpace

Much like the standard ColorSpace node, you can use the OCIOColorSpace node for converting an image sequence from one colorspace to another. The OCIOColorSpace node is based on the OpenColorIO library. For more information, see https://opencolorio.org.

Note: There are a number of NDK examples covering OCIO workflows that ship with the Nuke developer documentation, which can be found here:
<install_directory>/Documentation/NDKExamples/Plugins/00b_8source.html

Inputs and Controls

Connection Type	Connection Name	Function
Input	unnamed	The image sequence to receive the colorspace transform.
mask	An optional image to use as a mask. By default, the colorspace transform is limited to the non-black areas of the mask. At first, the mask input appears as a triangle on the right side of the node, but when you drag it, it turns into an arrow labeled mask. If you cannot see the mask input, ensure that the mask control is disabled or set to none.

Connection Type

Connection Name

Function

Input

unnamed

The image sequence to receive the colorspace transform.

mask

An optional image to use as a mask. By default, the colorspace transform is limited to the non-black areas of the mask.

At first, the mask input appears as a triangle on the right side of the node, but when you drag it, it turns into an arrow labeled mask. If you cannot see the mask input, ensure that the mask control is disabled or set to none.

Control (UI)	Knob (Scripting)	Default Value	Function
OCIOColorSpace Tab
channels	channels	rgb	The ColorSpace transform is applied only to 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.
input	in_colorspace	linear	Specifies the colorspace of your input image. Note: The control label has been updated, but the knob name currently remains the same. The knob name will also change in a future release.
output	out_colorspace	linear	Specifies the colorspace you want to convert the image to. Note: The control label has been updated, but the knob name currently remains the same. The knob name will also change in a future release.
swap input/output	swap	n/a	Swaps the selected input and output colorspace knobs. This can be useful if you're doing certain comp tasks that work better in certain colorspaces, such as grading. For example, you might go from ACEScc (input) to scene_linear (output) in a OCIOColorspace node, perform a Grade node adjustment, copy the first Colorspace node after the Grade node, and click the swap input/output button to go back to ACEScc.
mask	N/A	disabled	Enables the associated mask channel to the right. Disabling this checkbox is the same as setting the channel to none.
mask	maskChannelInput	none	The channel to use as a mask. By default, the colorspace conversion is limited to the non-black areas of this channel.
inject	inject	disabled	Copies the mask input to the predefined mask.a channel. Injecting the mask allows you to use the same mask further downstream.
invert	invert_mask	disabled	Inverts the use of the mask channel so that the colorspace conversion is limited to the non-white areas of the mask.
fringe	fringe	disabled	When enabled, only apply the effect to the edge of the mask. When disabled, the effect is applied to the entire mask.
(un)premult by	N/A	disabled	Enables the associated channel to the right. Disabling this checkbox is the same as setting the channel to none.
(un)premult by	unpremult	none	The image is divided by this channel before being processed, and multiplied again afterwards. If you are using premultiplied input images, you may want to check (un)premult by and select rgba.alpha here. This will simulate doing the color conversion before the premultiplication was done. It is the same as adding an Unpremult node before this node and a Premult node after, but allows you to work faster if you’re only using one color correct node. If you are using unpremultiplied input images, you should leave this set to none.
invert	invert_unpremult	disabled	Inverts the use of the (un)premultiply channel.
mix	mix	1	Dissolves between the original image at 0 and the full colorspace conversion at 1.
Context Tab
key1	key1	n/a	Allows you to add variables to register certain viewer processes by creating a custom config.ocio and specifying the variable in the to_reference file transform. See Adding Context Viewer Processes for more information.
value1	value1	n/a
key2	key2	n/a
value2	value2	n/a
key3	key3	n/a
value3	value3	n/a
key4	key4	n/a
value4	value4	n/a

Step-by-Step Guides

Converting Color Spaces with the OCIOColorSpace Node