Scarlet Glow
#cb0103
A red that is saturated. It is mid — the hardest range to put text on, either colour struggles.
Hex
#cb0103
RGB
203, 1, 3
OKLCh
52.9% 0.217 29.0°
CIELAB (D50)
43.2, 68.0, 57.8
What is true of this colour, and of no other
- 21 other named colours sit within ΔE00 2 of it — this part of the space is crowded, and the names here are finer distinctions than most people make.
- It sits exactly on the sRGB boundary: at this lightness and hue the gamut has nothing left, and a wider display would show a more colourful version of it.
- As text on white it measures APCA Lc 76.8; on black, Lc -25.0. The sign is the polarity, which the WCAG ratio discards.
- Built into an eleven-step scale, 10 of the 10 adjacent pairs stay ΔE00 2 apart — see the ramp.
- protanopia and deuteranopia and tritanopia shift it by ΔE00 40.2 and 42.9 and 47.6 — no red cone.
Text on this colour
White text
5.92:1 — passes AA
Black text
3.54:1 — large text only
White text is the better of the two at5.92:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#cb0103
protanopia
#49490b · ΔE00 40.2
deuteranopia
#747400 · ΔE00 42.9
tritanopia
#949400 · ΔE00 47.6
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isSignal at ΔE00 0.237: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- SignalΔE00 0.237 · #cc0002
- Rebellion RedΔE00 0.295 · #cc0404
- Albanian RedΔE00 0.347 · #cc0001
- CommunistΔE00 0.48 · #cc0000
- Lannister RedΔE00 0.538 · #cd0101
- Naga MorichΔE00 0.539 · #c90406
- Love for AllΔE00 0.569 · #cd0106
- Soviet RedΔE00 0.608 · #cd0000
- Thai ChilliΔE00 0.694 · #ce0001
- Diablo RedΔE00 1.019 · #cd0d01
- Red EpiphyllumΔE00 1.154 · #d00000
- Highway to HellΔE00 1.157 · #cd1102
7 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.