From: Marco Ugolini <email@hidden>
Subject: Re: What's in a profile?
To: Lee Blevins <email@hidden>
Cc: ColorSync Users Mailing List <email@hidden>
Message-ID: <C0E99156.A297%email@hidden>
Content-Type: text/plain; charset="US-ASCII"
There are:
- matrix-based profiles (using the type of matrices you learn of in linear
algebra, usually 3x3): these are found in RGB working profiles like
AdobeRGB, ColorMatch RGB and ProPhoto RGB;
- and then there are profiles that are based on LUTs (Look-Up Tables, 2 per
rendering intent: one from source profile to the Profile Connection Space,
i.e. A2B; the other from the PCS to the target profile, i.e. B2A). CMYK
output profiles are LUT-based (e.g., US Web Coated (SWOP) v2, US Sheetfed
Coated v2, etc.).
But it's worthy of mention to note that there is one RGB working space that
I know of, PhotoGamutRGB, that breaks the "rule" and is LUT-based.
