Class Notes (834,529)
Canada (508,576)
GRA 633 (6)
Lecture 4

GRA 633 Lecture 4: GRA633 – Lecture 4

3 Pages
98 Views
Unlock Document

Department
Graphic Communications
Course
GRA 633
Professor
Abhay Sharma
Semester
Winter

Description
GRA633 – Lecture 4 Who is the ICC? - ICC (international colour consortium) - An organization that is dedicated to the open-communication of colour between devices - They started as a group of prepress vendors (Kodak, Apple, Adobe, Agfa, Microsoft) interested in creating a cross-platform, vendor neutral colour management system - based around ICC profiles - ICC profiles link device counts (CMYK, RGB) with a device independent colour space like L*a*b* or XYZ - Colourimetric colour space is a common language for all profiles making it fairly easy to convert between devices o Called the profile connection space (PCS) - A colour management system can convert from device counts to colourimetric values (A2B) through a profile or from colourimetric values to device counts (B2A) o A2b ▯ actual device colour o B2a ▯ profile connection space - ICC profile describe how a colour is made with the specific colourants and conditions of the device - Uses lookup tables (LUTs) to record the links o It is a 3 or 4 dimensional lit of device counts that link with the three- dimensional colourimetric values (L*a*b* or XYZ) - Each LUT is responsible for a one-way link from device counts to colourimetric values or the other way around o A2b – takes in device counts ▯ looks up that value in one half of the table, then spits out L*a*b* value in the other half - profiles don’t really do anything > they are just cables - there are seven distinct types of profiles that are defined by ICC for different purposes o output profiles o input profiles o monitor profiles o device link profiles o n-channel (multi-channel) profiles o abstract profiles o space profiles - output profile o used for printers or other types of output devices (except monitors) o can be either CMYK or RGB device counts o two-way profile contains a2b and b2a LUTs o PCS is usually L*a*b* but can be XYZ - input profile o used for scanners or digital cameras - monitor profiles o used to profile LCD and CRT monitors o RGB device counts only o A two way profile containing a method for translating RGB▯PCS and PSC▯RGB but sometimes does nto contain A2B and B2A LUTs but a mathematical function that describes each RGB channel o PCS is most commonly XYZ but can be L*a*b* - device link profiles
More Less

Related notes for GRA 633

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit