Tuesday, February 22, 2011

Week 2 - Colour Management Revision.

1. What is the purpose of colour management?

To ensure consistant colour representation across various devices AKA: Scanners, cameras, monitors, printers, tv screens ETC.

2. What problem makes colour management necessary?

Inconsistancy in colour between devices, aka when the original image, scanner, monitor and printer don't match and you print out something different to what you see on screen.

3. Components of a device profile.

- Colour gamut (Range)
- White point (To do with luminance)
- Luminance (Brightness values)
- Colour temperature
- Conversion instructions

4. The difference between a device profile and a working space.

WORKING PROFILE - No reference to any particular piece of equipment
DEVICE PROFILE - Relates to a specific device

5. Reference colour space and how it is used.

Some examples of reference colour spaces are CIE, LAB, XYZ. They are used when using converting software to convert colours from one device to another.

6. Difference between calibrating and profiling.

CALIBRATE: Use physical devices to make the devices physically optimum - physically changing things such as brightness and contrast

PROFILE - Measures device colour gamut and creates a profile.

7. What is a rendering intent?

A rendering intent is a set of instructions or a methodology when converting between colour spaces.

8. Rendering intents that are most useful to photographers.

-Absolute colourmetric: To do with proofing purposes
- RELATIVE COLOURMETRIC: Brings out of gamut colours onto the boundary and doesn't move in rage colours
- PERCEPTUAL COLOURMETRIC: Brings out of gamut colours in and keeps the relationship with other colours, therefore moves them too so the tonal range stays the same.


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