Comments (1)
mm2
commented on July 29, 2024
Thanks for pointing out. I checked the actual spec and you are right. I was wondering how this could have been there for so many years unnoticed, so something ringed a bell in my head. After checking the old spec 4.0.0 (ICC1-V40.pdf, ICC.1:2001-12) that is what it says:
6.1.13 Profile ID
Profile ID is generated by using the MD5 fingerprinting method (details of which can be found via the Technical Notes page on the ICC web-site - www.color.org).. The entire profile, based on the size field in the
header, is used to calculate the ID with the exception of the Rendering intent, Header attributes, and Profile ID fields in the profile header for which zeros are used instead of their actual values. A Profile ID value
of zero indicates the ID has not been calculated. However, it is strongly recommended that profile creators
do calculate and fill in the correct value in the Profile ID field
Which is absolutely amazing. ICC changed the spec and I cannot find any notes of this change in the errata. I am modifying the code to reflect this change, wondering how many profiles I will break in the process.
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