Goals for profile assessment

Security

• Profile class is consistent with data colour space
• Header content conforms with specification
• Tags present correspond to profile version
• Wtpt correctly encoded - D50 for v4 display; or valid value for other profile classes
• Reserved bytes are zero
• Tags start and end on four-byte boundaries

Conformance

• Tags types are correctly encoded
• signature, structure, data types, ranges, encoded values
• cprt, desc tags encoded as Unicode or text according to specification version
• Tags only use tag types allowed for the tag
• All required tags for profile class are present
• Additional tags not required for profile class (other than allowed optional tags) are not present; or are flagged as private tags
• Private tags have a registered signature
• Provate tag documentation is available through the tag registry
• Undocumented private tags are identified
• Profile class is consistent with data colour space
• Header content conforms with specification
• Tags present correspond to profile version
• Wtpt correctly encoded - D50 for v4 display; or valid value for other profile classes
• Reserved bytes are zero
• Tags start and end on four-byte boundaries

Quality
The following items are reported:

• First and second round trip average and maximum differences in CIEDE2000
• Curve round trip differences in CIEDE2000 (i.e. can be inverted)
• Smoothness metric values of overall transform
• If characterization data is present, round trip average and maximum differences of profile output in CIEDE2000

This list is a guide only and is not comprehensive. There is no guarantee that a profile that meets the requirements listed will be suitable for a given application. iccMAX profiles may have different conformance requirements.

Compare ICC profiles and characterization data sets at https://chardata.colourbill.com/