HEX to OKLCH: #8B008B

Also known as: CSS darkmagenta

#8B008B → oklch(0.447 0.205 328.4)

Values are shown at full precision, so converting back gives exactly #8b008b. The rounded form is what you normally paste into CSS.

Step-by-step math

Every number below is computed from the input, nothing is looked up.

1. sRGB → linear

R: 139/255 = 0.54510 → 0.258183  (((x + 0.055) / 1.055)^2.4)
G: 0/255 = 0.00000 → 0.000000  (÷ 12.92)
B: 139/255 = 0.54510 → 0.258183  (((x + 0.055) / 1.055)^2.4)

2. linear sRGB → LMS

l = 0.4122·R + 0.5363·G + 0.0514·B = 0.119711
m = 0.2119·R + 0.6807·G + 0.1074·B = 0.082438
s = 0.0883·R + 0.2817·G + 0.6300·B = 0.185448

3. cube root

l′ = ∛0.119711 = 0.492846
m′ = ∛0.082438 = 0.435220
s′ = ∛0.185448 = 0.570261

4. LMS′ → Oklab

L = 0.2105·l′ + 0.7936·m′ − 0.0041·s′ = 0.44680
a = 1.9780·l′ − 2.4286·m′ + 0.4506·s′ = 0.17483
b = 0.0259·l′ + 0.7828·m′ − 0.8087·s′ = -0.10771

5. Oklab → OKLCH

C = √(a² + b²) = 0.20535
H = atan2(b, a) = 328.363°
L = 0.44680

6. OKLCH

oklch(0.44680 0.20535 328.363)
rounded: oklch(0.447 0.205 328.4)

All formats

HEX: #8b008b
RGB: rgb(139 0 139)
RGB (legacy): rgb(139, 0, 139)
HSL: hsl(300.00 100.00% 27.25%) → hsl(300 100% 27%)
HWB: hwb(300 0% 45%)
OKLCH: oklch(0.447 0.205 328.4) · oklch(44.7% 0.205 328.4)
OKLab: oklab(0.447 0.175 -0.108)
Lab (D50): lab(32.50 59.56 -38.52)
LCH (D50): lch(32.50 70.94 327.11)
Display P3: color(display-p3 0.4982 0.0902 0.5266)
Linear sRGB: color(srgb-linear 0.2582 0.0000 0.2582)

Gamut: sRGB and Display P3

#8B008B is a hex color, so it sits inside sRGB and therefore inside Display P3. At this lightness and hue, sRGB reaches chroma 0.205 and Display P3 reaches 0.224; this color uses 100% of the sRGB chroma available.

CSS snippets

.element {
  color: #8b008b;
  color: rgb(139 0 139);
  color: hsl(300 100% 27%);
  color: oklch(0.447 0.205 328.4);
}

/* Tailwind CSS v4 */
@theme {
  --color-brand: oklch(0.447 0.205 328.4);
}
/* arbitrary values */
class="text-[#8b008b] bg-[oklch(0.447_0.205_328.4)]"

/* wide-gamut screens */
@media (color-gamut: p3) {
  .element { color: color(display-p3 0.4982 0.0902 0.5266); }
}

/* relative color syntax: 10% darker */
.element-dark { color: oklch(from #8b008b calc(l - 0.1) c h); }

Nearby colors

Closest colors in the Tailwind and CSS named palettes (OKLab distance).

Lighter and darker, same hue and chroma

#9F239E · oklch(0.507 0.205 328.4) · ΔL +0.06
#780078 · oklch(0.387 0.205 328.4) · ΔL −0.06

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