Selecting the LUT to Use

To select the LUT to use when reading or writing an image:

1.   Double-click to open the Read or Write node’s properties panel.
2.   From the Input Transform or output transform dropdown menus, select the LUT you want to use. To use the default LUT defined in Nuke’s settings for the image type in question, select default.

Default LUT Settings

By default, Nuke uses the following LUTs in the following cases:

LUT

File Type / Device

Default LUT

working space

This determines what colorspace files should be converted to when read and from when written- it's the colorspace used by Nuke under the hood. In earlier releases of Nuke, this colorspace was hidden because linear was always chosen as the working space. You may find that some operations work better in colorspaces other than linear. For example, some transforms work better in the CLog colorspace.

Note:  You can only change the working space if you're using OCIO color management.

linear

monitor

This is used for postage stamps, OpenGL textures, the color chooser display, and all other non-Viewer image displays.

sRGB

8-bit files

This is used when reading or writing image files that contain 8-bit data. Also used by the Merge node’s sRGB switch, and to convert Primatte inputs into sRGB and outputs from sRGB.

sRGB

16-bit files

This is used when reading or writing image files that contain 16-bit integer data (not half float).

sRGB

log files

This is used when reading or writing .cin or .dpx files.

Cineon

float files

This is used when reading or writing image files that contain floating-point data.

linear

To Change the Default LUT Settings

1.   Select Edit > Project Settings to open the settings for the script.
2.   Go to the Color tab.
3.   From the dropdown menus under Default LUT settings, select the LUTs you want to use by default for each file type or device.

The new defaults are now used for any LUT setting where you have not selected a specific LUT. Any controls you have set to a specific LUT (that is, not set to default) continues to use the selected LUT, and only those set to default are affected.