C64 Blue
#003aff
A blue that is about as vivid as sRGB can show at this lightness. It is mid — the hardest range to put text on, either colour struggles.
Hex
#003aff
RGB
0, 58, 255
OKLCh
49.3% 0.285 264.0°
CIELAB (D50)
36.2, 49.5, -101.0
What is true of this colour, and of no other
- 3 other named colours sit within ΔE00 2 of it.
- 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 81.9; on black, Lc -20.0. 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.
- All three dichromacies see it as very nearly the same colour you do: its hue is not the part carrying its identity.
Text on this colour
White text
6.89:1 — passes AA
Black text
3.05:1 — large text only
White text is the better of the two at6.89:1. That is enough for body text.
The same colour, with one cone missing
As you see it
#003aff
protanopia
#3737ff · ΔE00 2.7
deuteranopia
#3030ff · ΔE00 3.0
tritanopia
#2828ff · ΔE00 4.0
The twelve nearest named colours
Ranked by CIEDE2000 — perceptual distance, not hex arithmetic. The closest isVibrant Blue at ΔE00 0.845: below 1.0 — an ordinary observer cannot tell these apart, even side by side. What the numbers mean.
- Vibrant BlueΔE00 0.845 · #0339f8
- Blinking BlueΔE00 1.564 · #0033ff
- Nightly EscapadeΔE00 1.577 · #0433ff
- Rare BlueΔE00 2.509 · #0044ff
- Vivid BlueΔE00 2.671 · #152eff
- Blue BouquetΔE00 2.776 · #0033ee
- Palatinate BlueΔE00 2.875 · #273be2
- Bright GreekΔE00 2.905 · #3844f4
- Scuff BlueΔE00 2.922 · #0044ee
- Magic InkΔE00 3.294 · #0247fe
- BlueshiftΔE00 3.4 · #2d47ff
- System Shock BlueΔE00 3.879 · #3a2efe
8 of these have no page of their own: pages exist for the 4,961 colours the dataset marks as good names.