InterColor Profile Format - CiteSeerX

InterColor Profile Format Specification Version 3.0 June 10, 1994
6 Tag Type Definitions
This section specifies the type and structure definitions used to create all of the
individual tagged elements in InterColor Profile Format. The data type description
identifiers are indicated at the right margin of each data or structure definition. An
effort was made to make sure one-byte, two-byte and four-byte data lies on one-byte,
two-byte and four-byte boundaries respectively, this required occasionally including
extra spaces indicated with “reserved for padding” in some tag type definitions. Value
0 is defined to be of “unknown value” for all enumerated data structures.
All tags, including private tags, have as their first four bytes (0-3) a tag signature
(a 4 byte character sequence) to identify to profile readers what kind of data is contained
within a tag. This encourages tag type reuse and allows profile parsers to reuse code
when tags use common tag types. The second four bytes (4-7) are reserved for future
expansion and must be set to 0 in this version of the specification. Each new tag
signature and tag type signature must be registered with the InterColor Consortium in
order to prevent signature collisions.
Where not specified otherwise, the low 16 bits of all 32 bit flags in the type
descriptions below are reserved for use by the InterColor Consortium.
When 7 bit ASCII text representation is specified in types below, each individual
character is encoded in 8 bits with the high bit set to zero. The details are presented in
Appendix C.
6.1 curveType
The curveType contains a 4 byte count value and a one-dimensional table of 2 byte
values. The byte stream is given below.
byte(s) content
0-3 ‘curv‘ (0x63757276) type descriptor
4-7 reserved, must be set to 0
8-11 count value specifying number of entries that follow
12-end actual curve values starting with the zeroth entry and ending with the entry
count-1.
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