St Giles Blue vs Impromptu
Where St Giles Blue belongs to Farrow & Ball's range, Impromptu is a Sherwin-Williams color. 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 Impromptu (LRV 23), a difference of 7 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 9.9 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.
St Giles Blue vs Impromptu in Real Spaces
4 real rooms side by side. St Giles Blue and Impromptu 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.
Kitchen
In a kitchen, colors are seen under bright task lighting that amplifies undertones — what reads neutral elsewhere can show its hand here. 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.
Color Details
St Giles Blue vs Impromptu Simulated Comparison
5 simulated room previews — drag the slider on each to see St Giles Blue on one side and Impromptu 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 St Giles Blue comparisons
See how St Giles Blue stacks up against other well-photographed colors across different brands and tones.
At LRV 69 vs 30, Ammonite is decisively the brighter choice.
White Dove reflects far more light (LRV 83 vs 30), opening up a space where St Giles Blue encloses it.
St Giles Blue reflects far more light (LRV 30 vs 6), opening up a space where Iron Ore encloses it.
At LRV 52 vs 30, Purbeck Stone is decisively the brighter choice.
Their light reflectance is nearly identical (LRV 30 vs 30), so neither reads brighter in a room.
Mizzle reflects far more light (LRV 52 vs 30), opening up a space where St Giles Blue encloses it.
At LRV 60 vs 30, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 30), opening up a space where St Giles Blue encloses it.
St Giles Blue reads slightly lighter (LRV 30 vs 27), a gap that shows most in low-lit rooms.
At LRV 43 vs 30, French Gray is decisively the brighter choice.
At LRV 30 vs 4, St Giles Blue is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 30), opening up a space where St Giles Blue encloses it.
St Giles Blue reflects far more light (LRV 30 vs 13), opening up a space where Bancha encloses it.
Hardwick White reflects far more light (LRV 44 vs 30), opening up a space where St Giles Blue encloses it.
At LRV 84 vs 30, Pure White is decisively the brighter choice.
A 9-point LRV gap (30 vs 21) makes St Giles Blue the marginally brighter of the two.
Balboa Mist reflects far more light (LRV 66 vs 30), opening up a space where St Giles Blue encloses it.
Shoji White reflects far more light (LRV 74 vs 30), opening up a space where St Giles Blue encloses it.
Snowbound reflects far more light (LRV 83 vs 30), opening up a space where St Giles Blue encloses it.
At LRV 51 vs 30, Pigeon is decisively the brighter choice.
St Giles Blue reflects far more light (LRV 30 vs 12), opening up a space where Pewter Green encloses it.
St Giles Blue reflects far more light (LRV 30 vs 8), opening up a space where Duck Green encloses it.
Skimming Stone reflects far more light (LRV 68 vs 30), opening up a space where St Giles Blue encloses it.
A 11-point LRV gap (41 vs 30) makes Dix Blue the marginally brighter of the two.
St Giles Blue reflects far more light (LRV 30 vs 12), opening up a space where Vintage Vogue encloses it.
Saybrook Sage reflects far more light (LRV 45 vs 30), opening up a space where St Giles Blue encloses it.
Their light reflectance is nearly identical (LRV 31 vs 30), so neither reads brighter in a room.