Question 1

What is colour gamut and does it matter for a monitor?

Accepted Answer

**Colour gamut** is the range of colours a display can reproduce. It matters enormously for some work and barely at all for others, and the specification is frequently misrepresented.

**The main colour spaces:**

**sRGB** — the standard for the web and most general content. It is the smallest of the common spaces, and it is what almost everything you view online was created in.

**DCI-P3** — a wider space used in digital cinema and now the standard for HDR content and most modern phones and premium laptops. It covers roughly 25% more of the visible spectrum than sRGB, mainly in reds and greens.

**Adobe RGB** — wider in **greens and cyans** specifically, developed for print work. It matters for photographers preparing work for CMYK printing.

**Rec.2020** — very wide, used as a target for future video standards, with no consumer display covering it fully.

**How coverage is expressed, and where the misrepresentation happens.** Two different figures are used and conflated:

**Coverage** — what proportion of the target space the display can reproduce. This is the useful number.

**Volume** or **gamut size** — how large the display's range is **relative** to the target. A display can show 130% of sRGB volume while failing to cover part of it, so the headline number can exceed 100% while the display is still incomplete.

**Always look for coverage**, and be sceptical of figures above 100%.

**Who needs a wide gamut:**

**Photographers, designers and video editors** producing work for others, where accuracy is the product. These users also need **calibration** with a hardware colorimeter, since gamut without accuracy is useless.

**Print work** specifically benefits from Adobe RGB.

**Who does not:** general use, office work, and programming. A wide-gamut monitor without proper colour management actually makes sRGB content look **oversaturated**, which is worse than a standard display.

**Also relevant:** bit depth, Delta E accuracy figures, and uniformity.

Question 2

What does a display's nits rating actually mean?

Accepted Answer

Nits measure luminance — how much light a display emits per unit area — and the figure matters most for two things people rarely connect: outdoor readability and HDR. What the number describes. One

Question 3

Should I use a TV as a computer monitor?

Accepted Answer

You can, and for some uses it works well — but several differences make a TV a poor desk monitor and a good living-room display, and they are not obvious from the specifications. Where TVs fall

Question 4

How does a camera sensor capture colour?

Accepted Answer

It does not, directly — sensor pixels only measure brightness. Colour is produced by placing tiny coloured filters over them and then reconstructing the missing information computationally. The Bayer

Question 5

What is screen burn-in and which displays suffer from it?

Accepted Answer

Burn-in is permanent image retention — a faint ghost of static content remaining visible after the content changes. It is caused by uneven ageing of the display's light-emitting elements rather than

Question 6

What is chroma subsampling, and why does text look bad over HDMI?

Accepted Answer

A compression technique that stores colour information at lower resolution than brightness, exploiting the fact that human vision is far more sensitive to brightness detail than to colour detail. It

Question 7

What does a projector's lumens rating mean, and what actually matters?

Accepted Answer

Lumens measure light output, and the number on the box is frequently measured in a way that bears little relation to the picture you will see — which is why projector specifications are among the

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