Rosemary Leaf vs Halcyon Green
Rosemary Leaf (Dulux) and Halcyon Green (Sherwin-Williams) come from different manufacturers. Rosemary Leaf reads as blue-green, while Halcyon Green reads as green-grey — two distinct hue families, not close cousins. Their light reflectance values are nearly the same — 40 vs 38 — so neither will read significantly brighter or darker than the other. Both share a cool character, which means they'll respond to light and surrounding materials in similar ways. A ΔE of 1.8 puts them in subtle territory — distinguishable in direct comparison, less so from across a room. Below you'll find 5 real-room photo comparisons where both colors appear side by side, plus 5 simulated room previews.
Rosemary Leaf vs Halcyon Green in Real Spaces
5 real rooms side by side. Rosemary Leaf and Halcyon Green 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
A living room wall sees more varied light than almost any other surface in the house, which makes the choice between these two more nuanced than a chip suggests. At this scale the difference is subtle — you'd need them side by side, as shown here, to reliably tell them apart.
Bedroom
Bedrooms are typically lit with warmer, lower light than the rest of the house — a condition that flatters warm tones and deepens cool ones. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
Bathroom
Small bathrooms intensify color. A shade that seems quiet in a larger room can feel immersive when you're surrounded by it on four walls. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
House
A full exterior is the most demanding test for a paint color — scale and outdoor light both amplify differences that seem small on a swatch. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
Kitchen Cabinets
Cabinet color is always seen in context — against countertops, backsplash, and hardware — which amplifies undertone differences that might disappear on a plain wall. In photos like these you're seeing the difference at its most direct. In a finished room, the distinction is there but not dramatic.
Color Details
Rosemary Leaf vs Halcyon Green Simulated Comparison
5 simulated room previews — drag the slider on each to see Rosemary Leaf on one side and Halcyon Green 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 Rosemary Leaf comparisons
See how Rosemary Leaf stacks up against other well-photographed colors across different brands and tones.
At LRV 69 vs 40, Ammonite is decisively the brighter choice.
White Dove reflects far more light (LRV 83 vs 40), opening up a space where Rosemary Leaf encloses it.
Rosemary Leaf reflects far more light (LRV 40 vs 6), opening up a space where Iron Ore encloses it.
A 12-point LRV gap (52 vs 40) makes Purbeck Stone the marginally brighter of the two.
A 10-point LRV gap (40 vs 30) makes Rosemary Leaf the marginally brighter of the two.
Mizzle reads slightly lighter (LRV 52 vs 40), a gap that shows most in low-lit rooms.
At LRV 60 vs 40, Agreeable Gray is decisively the brighter choice.
Accessible Beige reflects far more light (LRV 58 vs 40), opening up a space where Rosemary Leaf encloses it.
Rosemary Leaf reflects far more light (LRV 40 vs 27), opening up a space where Denim Drift encloses it.
A 3-point LRV gap (43 vs 40) makes French Gray the marginally brighter of the two.
At LRV 40 vs 4, Rosemary Leaf is decisively the brighter choice.
Tranquil Dawn reflects far more light (LRV 55 vs 40), opening up a space where Rosemary Leaf encloses it.
Rosemary Leaf reflects far more light (LRV 40 vs 13), opening up a space where Bancha encloses it.
Hardwick White reads slightly lighter (LRV 44 vs 40), a gap that shows most in low-lit rooms.
At LRV 84 vs 40, Pure White is decisively the brighter choice.
At LRV 40 vs 21, Rosemary Leaf is decisively the brighter choice.
Balboa Mist reflects far more light (LRV 66 vs 40), opening up a space where Rosemary Leaf encloses it.
Shoji White reflects far more light (LRV 74 vs 40), opening up a space where Rosemary Leaf encloses it.
Snowbound reflects far more light (LRV 83 vs 40), opening up a space where Rosemary Leaf encloses it.
A 11-point LRV gap (51 vs 40) makes Pigeon the marginally brighter of the two.
Rosemary Leaf reflects far more light (LRV 40 vs 12), opening up a space where Pewter Green encloses it.
Rosemary Leaf reflects far more light (LRV 40 vs 8), opening up a space where Duck Green encloses it.
Skimming Stone reflects far more light (LRV 68 vs 40), opening up a space where Rosemary Leaf encloses it.
Their light reflectance is nearly identical (LRV 41 vs 40), so neither reads brighter in a room.
Rosemary Leaf reflects far more light (LRV 40 vs 12), opening up a space where Vintage Vogue encloses it.
Saybrook Sage reads slightly lighter (LRV 45 vs 40), a gap that shows most in low-lit rooms.
A 9-point LRV gap (40 vs 31) makes Rosemary Leaf the marginally brighter of the two.