RAL 820-4 vs Portsmouth
Where RAL 820-4 belongs to RAL Effect's range, Portsmouth is a Sherwin-Williams color. These are both blue-greys, so the question isn't which hue to choose — it's where within blue-grey to land. They have nearly identical light reflectance values (23 vs 22), so they'll read as similarly Dark in most lighting conditions. The ΔE 4.4 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.
RAL 820-4 vs Portsmouth in Real Spaces
1 real room side by side. RAL 820-4 and Portsmouth 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. The distinction reads clearly at room scale, making the choice between them concrete.
Color Details
RAL 820-4 vs Portsmouth Simulated Comparison
5 simulated room previews — drag the slider on each to see RAL 820-4 on one side and Portsmouth 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 RAL 820-4 comparisons
See how RAL 820-4 stacks up against other well-photographed colors across different brands and tones.
