Cook's Blue vs St Giles Blue
Both from Farrow & Ball's palette. Both sit in the blue family, which is useful context if you're narrowing within a single hue direction. St Giles Blue (LRV 30) reflects noticeably more light than Cook's Blue (LRV 25), a difference of 5 points that becomes especially apparent in rooms with limited natural light. Both lean cool, so they'll behave similarly in mixed or changing light conditions. The ΔE 8.7 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 4 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Cook's Blue vs St Giles Blue in Real Spaces
4 real rooms side by side. Cook's Blue and St Giles Blue are close enough that the difference can be hard to judge from a chip alone — these photos show how each reads at scale, across different spaces and lighting conditions.
Living Room
In a living room, color works across both daylight and evening light — the same wall can read very differently at noon and at 8pm. The brightness difference is modest but present — St Giles Blue gives the walls a little more lift.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. St Giles Blue reads slightly lighter here — a subtle but real difference in how open the space feels.
Front Door
A front door is a focal point — small color differences read clearly at this concentrated scale. The brightness difference is modest but present — St Giles Blue gives the walls a little more lift.
Kitchen Cabinets
Kitchen cabinets are constantly compared against adjacent materials, which means subtle differences between these two become much more visible. St Giles Blue reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Cook's Blue vs St Giles Blue Simulated Comparison
5 simulated room previews — drag the slider on each to see Cook's Blue on one side and St Giles Blue on the other.
Digital color is approximate. These simulations are generated from the manufacturer's hex values and overlaid on grayscale room photos — your screen's calibration, brightness, and viewing angle all affect how they render. Before committing to either color, test physical samples in your own space under the light you actually live with.
More Cook's Blue comparisons
See how Cook's Blue stacks up against other well-photographed colors across different brands and tones.
Ammonite reflects far more light (LRV 69 vs 25), opening up a space where Cook's Blue encloses it.
At LRV 83 vs 25, White Dove is decisively the brighter choice.
At LRV 25 vs 6, Cook's Blue is decisively the brighter choice.
Purbeck Stone reflects far more light (LRV 52 vs 25), opening up a space where Cook's Blue encloses it.
Evergreen Fog reads slightly lighter (LRV 30 vs 25), a gap that shows most in low-lit rooms.
At LRV 52 vs 25, Mizzle is decisively the brighter choice.
Agreeable Gray reflects far more light (LRV 60 vs 25), opening up a space where Cook's Blue encloses it.
At LRV 58 vs 25, Accessible Beige is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 27 vs 25), so neither reads brighter in a room.
French Gray reflects far more light (LRV 43 vs 25), opening up a space where Cook's Blue encloses it.
Cook's Blue reflects far more light (LRV 25 vs 4), opening up a space where Naval encloses it.
At LRV 55 vs 25, Tranquil Dawn is decisively the brighter choice.
A 12-point LRV gap (25 vs 13) makes Cook's Blue the marginally brighter of the two.
At LRV 44 vs 25, Hardwick White is decisively the brighter choice.
Pure White reflects far more light (LRV 84 vs 25), opening up a space where Cook's Blue encloses it.
Cook's Blue reads slightly lighter (LRV 25 vs 21), a gap that shows most in low-lit rooms.
At LRV 66 vs 25, Balboa Mist is decisively the brighter choice.
At LRV 74 vs 25, Shoji White is decisively the brighter choice.
At LRV 83 vs 25, Snowbound is decisively the brighter choice.
Pigeon reflects far more light (LRV 51 vs 25), opening up a space where Cook's Blue encloses it.
At LRV 25 vs 12, Cook's Blue is decisively the brighter choice.
At LRV 25 vs 8, Cook's Blue is decisively the brighter choice.
At LRV 68 vs 25, Skimming Stone is decisively the brighter choice.
Dix Blue reflects far more light (LRV 41 vs 25), opening up a space where Cook's Blue encloses it.
At LRV 25 vs 12, Cook's Blue is decisively the brighter choice.
At LRV 45 vs 25, Saybrook Sage is decisively the brighter choice.
Pale Green reads slightly lighter (LRV 31 vs 25), a gap that shows most in low-lit rooms.