Imaging workflow

Question 1

How has colour management evolved?

Answer 1

80s = mobiles no colour
90s = mosaic system - grey and text based
'95 = internet explorer accommodates colour images
2004 = facebook launched
2007 = facebook has 1.7 bn images
2010 = increased social networking
2013 = 350 million images uploaded pr day
2014 = 1.8 billion per day

Question 2

How do we ensure success in Photoshop?

Answer 2

1. Every image must have a profile.
2. Colour conversions need 2 profiles.
3. Avoid hard proofing until later in the workflow.
4. Avoid using the PS workspace.

Question 3

What is image quality dependant on, on screen?

Answer 3

1. Monitor Gamma.
2. Light Output.
3. Device voltage.

Question 4

What are the issues assosciated with colour management?

Answer 4

1. Device Dependancy.
2. Media Dependancy.
3. Colour Gamut.
4. Variable Performance.
5. Viewing Conditions.

Question 5

What is an ICC profile?

Answer 5

• Data characterising an input or output device or colour space.
• By the International Colour Consortium.
• Multiple profiles created for different substrates.

Question 6

What are the pros and cons of the ICC profile?

Answer 6

Pros: Reproducible and faithful results.
Cons: Expensive and time consuming.

Question 7

How are profiles created?

Answer 7

1. Sequences of RGB colours are displayed.
2. Digital cameras and scanners (physical charts are digitised.
3. Sampled RGB values and measured with physical chart colours and construct a profile.

Question 8

What does gamut clipping make an image?

Answer 8

Duller.

Question 9

What does gamut compressing make an image?

Answer 9

Paler.

Question 10

List the 4 different rendering intents.

Answer 10

1. Saturation intent - preserves saturation of colours.
2. Absolute colour metic intent - preserves white point.
3. Relative colour metric intent - maintains exact relationship with in gamut colours.
4. Perceptual intent - tries to preserve relationship between out of gamut.

Question 11

Explain the imaging workflow.

Answer 11

1. Image file stores camera profile.
2. Converts image from RGB to sRGB.
3. sRGB Image display profile.

Question 12

What is a colour management module?

Answer 12

• Interprets the device profiles and carries out the instructions on what to do with different devices of colour gamuts.

Question 13

What is the ICC digital imaging workflow?

Answer 13

• A device independent colour space.

- Device profiles that define the colour characteristics of a specific device.