Lesson 11 & 12 - Colour Management

Lesson 11

Colour Management

* Tutorial Demonstration by Geoff on Monitor Callibration


Colour Management
Device Independent Colour Space
- Device independent colour space has no dependence to device eg. RGB, SRGB
- Don’t relate to a particular device
- Typically used as a working space

Gamut
- Refers to Device dependant working space: eg RGB, SRGB, Pro photo
Profile
- Contains a colour gamut and information on how to convert another colour space into that gamut rendering intent

- Software: colour management module eg. Adobe
- We need to know the colour Gamut for each profile/device and how we can convert numbers
- Reference colour space

Colour Managed
- What the camera captures will be as closely represented as possible on monitor/printer
- The number will change

Working Space
- A space inside a computer to work on device

Where do we get profiles
- Default: comes with generic
- Create one: calibrate (custom profile)
- Canned profile (mostly for printer) – can download from internet for your particular printer/paper

Callibration
- Adjusting luminance/brightness/colour temp eg use of monitor controls
- Important to physically adjust monitor to what you want the closer the software can create a correct profile

Profile compensates for what isn’t quite right

Profiles are saved as ICC or ICM files

Soft proofing
- Previewing on monitor what it will look like when printed with a particular printer/paper

Rendering Intent
- When the gamut of source color space exceeds that of the destination, saturated colors are liable to become clipped (inaccurately represented), or more formally burned. The color management module can deal with this problem in several ways.

Unmanaged Colour Profile
- Non-colour Managed Profile leads to unreliable colour workflow
- Each device (camera/monitor/printer) interprets colour differently
- - Because each device has its own gamut

Gamut
- Device dependant
- The range of colours a device can reproduce
Can be represented by a 2d xy chromaticity diagram (LAB or XYZ)




- CIE (international Colour Standards) Colour space (xyz & lab)
- Device dependant Colour Space
- Any device that we can see colour can be shown on above diagram
- Additive device. Eg monitor
- Subtractive eg printer
- Printer has a small colour gamut

Photoshop
- View menu – Gamat Warning
- If it goes grey it means its not in the printer gamut