Datacolor Spyder3 Elite Help Manual page 101

ICC Settings
Help Index
The Long Answer
The following items may be set in ICC Settings:
ICC Version
You can choose to create ICC Profiles that meet version 2.0 or 4.0 of the ICC
Specification. The default value is 2.0.
2.0
Version 2.0 profiles are compatible with all applications and Color Management
Modules (CMMs). This is the appropriate choice for most users.
4.0
Version 4.0 profiles include the Chromatic Adaptation tag ('chad') and have their
Media White Point tag ('wtpt') set to D50. Additionally the header contains a valid
MD5 "fingerprint" for the Profile ID.
Chromatic Adaptation Mode
When recording colorimetric values in a profile, XYZ values need to be Chromatically
Adapted from their measured color space to the D50 color space that is used by the
ICC profile. There are different Adaptation Algorithms that can be used to perform this
computation.
Bradford
The Bradford transformation is recommended by the ICC Specification and other
sources as being the best adaptation method to be used. This is the default value.
XYZ Scaling