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Re: color-profile

From: Sigurd Lerstad <sigler@bredband.no>
Date: Sat, 11 Oct 2003 20:44:18 +0200
Message-ID: <0ba301c39027$adac7270$6e1273d5@mmstudio>
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?


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
> 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

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