week 4 Flashcards
(21 cards)
What is the ICC?
International Colour Consortium - dedicated to the open-communication between devices
What is ICC colour management?
Based around ICC profiles; link device counts with a device independent colour space
What is the Profile Connection Space?
The colorimetric colour space is a common language for all profiles making it easier to convert between devices
What is a lookup table responsible for?
responsible for a one way link from device counts to colorimetric values
What are the types of ICC profiles?
Monitor, Output, Input, Device links, N-Channel, Abstract, Space
What is used for printers and other output devices, CMYK or RGB, has a two way profile, PCS: Lab, XYZ
Output profile
What is used for scanners or digital cameras, only uses RGB, only has a one way profile, PCS: Lab, XYZ
Input profile
What is used for profile LCD and CRT monitors, only uses RGB, uses a two way profile, PCS: XYZ, Lab
Monitor profile
What is used to translate between two sets of the same type of device counts (eg. CMYK -> CMYK) uses a two way profile, no PCS
Device Link profile
What is used for complex printing with spot colours, uses a two-way profile, PCS: Lab, XYZ
N-Channel (multichannel) profile
What is used to define Lab* to Lab* conversions, no device counts
Abstract profile
What is used to convert a non-device colour space to a profile connection space
Space Profiles
What is the role of rendering intents?
Used to remap colour when converting between two colour specs that do not match so all colours can be printed
What are the types of rendering intents?
Perceptual, Saturation, Absolute, Perceptual
When would you use perceptual rendering intent?
When you want to keep the relative difference between all colours and don’t care as much about the colour reproduction
When would you use saturation rendering intent?
When you want the most saturated and brightest colours and do not care about detail
When would you use relative colorimetric rendering intent?
For printing one-offs when you want accurate colour and the purest white possible
When would you use absolute colorimetric rendering intent?
Used for accurate colour proofing - when proof and press sheet paper is different and colour is crucial
What are the advantages of custom profiles?
Takes into account the behavior of your specific device and its condition,
Can deal with custom and non-standard media, utilizes the full colour gamut of the device
What are the types of device profiles?
Custom, generic, standard
What colour space has a larger gamut?
RGB
