User Manual

the menu. Clicking the Remove Curve checkbox then removes the gamma curve,
converting the image to linear gamma.
MediaIn and Loader nodes include a
Remove Curve checkbox in the Inspector.
 FileLUT node: The FileLUT node, found in the LUT category of the Effects Library,
lets you do a conversion using any LUT you want, giving you the option to manually
load LUTs in the ALUT3, ITX, 3DL, or CUBE format to perform a gamma and gamut
conversion. Although LUTs are very commonly placed at the end of a node tree for
final rendering, you’ll get more accurate gamma and color space conversions using the
Gamut and CineonLog nodes to transform your MediaIn and Loader nodes into linear.
Applying LUTs to a Viewer
Images converted to a linear gamma don’t look correct. They usually look very dark, with
extremely bright highlights and oversaturated colors. Happily, even though the image may
appear to be incorrect, the fact that Fusion can work entirely with floating-point color data
means that you’re not actually clipping or losing any image data. It just looks completely wrong
when viewing the linear state of your image data directly.
A clip displayed with a nonlinear, log gamma curve (left) and the clip transformed to linear gamma (right).
It would be impossible to work if you couldn’t view the image as it’s supposed to appear within
the final gamut and gamma you’ll be outputting. For this reason, each viewer has a LUT menu
that lets you enable a “preview” color space and/or gamma conversion, while the node tree is
processing correctly in linear gamma.
Chapter – 68 Managing Color for Visual Effects 1373