2017

For example, to directly convert back and forth between 4 color spaces, you would need 12 different
transformations. Adding a fifth color space would require 8 more, or 20 in total. In general, adding an Nth
space requires an additional 2(N – 1) transforms, or N
2
– N transforms in total.
However if you use a connection space, you only need 8 transformations to convert back and forth between
4 color spaces. Each additional color space requires only 2 additional transforms, or 2N transforms in total.
But note that each conversion now requires two steps: the first to convert from the source space to the
connection space, and the second to convert from the connection space to the target space.
Autodesk Color Management includes transforms that allow you to convert back and forth between color
spaces using one of two connection spaces:
■ ACES can be used as a connection space for scene-linear images.
■ The camera/ directory contains transforms for converting from various digital camera formats.
■ The film/ADX/ directory contains transforms for converting to and from Academy Density Exchange
format.
■ The interchange/ACESproxy/ directory contains transforms for converting to and from the ACESproxy
system used on set.
■ The RRT+ODT/ directory contains transforms for converting to and from various output-referred
spaces.
■ CIE XYZ can be used as a connection space for output-referred images, that is, for images that do not
require any tone-mapping. The transforms in the collection include any chromatic adaptation necessary
to convert to and from the CIE XYZ white point of D65, if required.
■ The display/ directory contains transforms for converting to and from various RGB color space
encodings for specific display devices.
■ The interchange/ directory contains transforms for converting to and from color spaces commonly
used for digital image exchange, including sRGB and AdobeRGB.
NOTE The transforms in the primaries/ directory convert only the primaries. They expect and produce a linear
color space encoding, and they can be applied to either scene-linear or output-linear values.
ACES
The Academy Color Encoding System (ACES) is an image interchange framework being developed by the
Science and Technology Council of the Academy of Motion Picture Arts and Sciences.
At the core of the ACES system is the Academy Color Encoding Specification (also known as ACES). This is
an extremely wide-gamut scene-linear space that can encode any visible color without using negative values.
The ACES system also includes a set of color transforms that can provide an innovative color managed
workflow. In particular, the ACES system provides the first standard high-quality tone-mapping algorithm
for converting scene-linear images to output-referred color spaces for viewing.
Autodesk Color Management | 1305