Portsmouth vs Underseas
Both from Sherwin-Williams's palette. Portsmouth reads as blue-grey, while Underseas reads as green-grey — two distinct hue families, not close cousins. Underseas (LRV 25) reflects noticeably more light than Portsmouth (LRV 22), a difference of 3 points that becomes especially apparent in rooms with limited natural light. Both lean neutral, so they'll behave similarly in mixed or changing light conditions. The ΔE 4.7 gap is real but not dramatic — close enough to use together, distinct enough to matter as a choice. Below you'll find 1 real-room photo comparison where both colors appear side by side, plus 5 simulated room previews.
Portsmouth vs Underseas in Real Spaces
1 real room side by side. Portsmouth and Underseas 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.
Bedroom
The context that matters most in a bedroom is how a color reads under a bedside lamp at night, not under noon daylight. Underseas reads slightly lighter here — a subtle but real difference in how open the space feels.
Color Details
Portsmouth vs Underseas Simulated Comparison
5 simulated room previews — drag the slider on each to see Portsmouth on one side and Underseas 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 Portsmouth comparisons
See how Portsmouth stacks up against other well-photographed colors across different brands and tones.
