ICC Profiles & Delta E: Why Print Colours Don't Match
In this video we explain how ICC profiles, CIELAB and Delta E help packaging printers match colour from design file to proof to press on board, film and paper.
Find prepress and colour partners on GPN: https://app.globalpackagingnetwork.com
CHAPTERS
0:00 Intro
0:12 Also in Hindi
0:18 Sponsor these videos
0:26 Same file, different colours
0:50 CIELAB: measuring colour
1:14 Delta E explained
1:40 What is an ICC profile
2:06 Four kinds of profiles
2:28 Standard profiles
2:54 How a press profile is made
3:20 Colour gamut
3:44 Rendering intents
4:08 Design to press workflow
4:32 Films, foils and kraft
4:54 Mistakes to avoid
5:14 Colour partners on GPN
5:30 Try it on GPN
5:44 Recap: 3 rules
6:02 Thank you
KEY POINTS
- The same CMYK values print differently on coated board, PE film and uncoated paper - CMYK is an instruction, not a colour
- CIELAB (L*, a*, b*) describes colour independent of the device; Delta E is the distance between two colours
- Worked example: target L47 a68 b48 vs sample L49 a63 b44 = Delta E 6.7 (CIE76) - a clearly visible difference
- Profile types: input, display, output (press / proofer) and device link
- Standard profiles: ISO Coated v2 (FOGRA39), PSO Coated v3 (FOGRA51), PSO Uncoated v3 (FOGRA52), GRACoL 2013 (CRPC6); custom press profiles for flexo and gravure on film
- Making a press profile: stabilise press, print IT8.7/4 chart (1,617 patches), measure, build, apply, verify
- Rendering intents: perceptual, relative colorimetric, saturation, absolute colorimetric
- Packaging special cases: reverse print with white backing, metallised film, kraft board, brand spot colours
Presented by Rajesh Modhvadia · Best viewed on a TV or big screen
Hindi version: https://youtu.be/AamqKAsi0eU
Previous video: Printed Carton Costing - https://youtu.be/qtg7pg-CZU0
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Note: Lab values and gamut shapes in this video are illustrative for learning.
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