- From: Sigurd Lerstad <sigler@bredband.no>
- Date: Sat, 11 Oct 2003 20:44:18 +0200
- To: "Chris Lilley" <chris@w3.org>
- Cc: "Dean Jackson" <dean@w3.org>, <www-style@w3.org>
The Profile ID field seems to be 16 bits I haven't looked to closely at the MD5 algorithm, but http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html says: [The MD5 algorithm] takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" What am I missing? thanks, -- Sigurd Lerstad > > On Monday, October 6, 2003, 6:43:35 PM, Sigurd wrote: > > SL> ***With current ICC proposals, the profile's unique ID is an MD5-encoded > SL> value within the profile header** > > SL> I have looked at the profile header description and I can't see any 128 bit > SL> MD5 value stored in there... > > > 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. > > Specification > ICC.1:2001-12 > File Format for Color Profiles (Version 4.0.0) > http://www.color.org/newiccspec.pdf >
Received on Sunday, 12 October 2003 09:35:16 UTC