Recognised as Colour

#F21B04

#F21B04
Red
Dark
Nearest: Red

#F21B04 is a red with RGB values 242, 27, 4 and HSL 6°, 97%, 48%. It is a dark colour, so black text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#F21B04#F21B04

HEX#F21B04

RGBrgb(242, 27, 4)

RGB (0–1)0.949, 0.1059, 0.0157

RGB percentages94.9%, 10.6%, 1.6%

HSLhsl(5.8, 96.7%, 48.2%)

HSV / HSBhsv(5.8, 98.3%, 94.9%)

CMYK0%, 88.8%, 98.3%, 5.1%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,866,628

CSS custom property--colour: #F21B04;

Brightness & contrast

Relative luminance0.1967WCAG 2.x, 0 is black and 1 is white

Perceived brightness133.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.93:1

Contrast with white4.26:1WCAG normal text: Fail

Contrast with black4.93:1WCAG normal text: AA

Greyscale equivalent#474747

Inverted#0DE4FB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#6B5D00no red cones; affects about 1% of men; ΔE 80.5 from the original

Deuteranopia#9D8A00no green cones; the most common form, about 1% of men; ΔE 79.5 from the original

Tritanopia#FF001Dno blue cones; rare, and affects men and women equally; ΔE 8.3 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text4.26:1WCAG large text: AA

Contrast with black, large text4.93:1WCAG large text: AAA

Named colours

Red · ΔE 6.8 Orange red · ΔE 10.3 Tomato · ΔE 26.3 Crimson · ΔE 30.8 Firebrick · ΔE 34.4 Coral · ΔE 36.9

Nearest named CSS colourRed (#FF0000)ΔE 6.83, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#04DBF2

Analogous#F20464, #F29204

Triadic#04F21B, #1B04F2

Split complementary#04F292, #0464F2

Tetradic#64F204, #04DBF2, #9204F2

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#FECAC4

Lighter +30%#FD9C92

Lighter +20%#FC6F60

Lighter +10%#FC412D

Darker −10%#C01503

Darker −20%#8E1002

Darker −30%#5B0A02

Darker −40%#290501

More saturated +25%#F61800

Less saturated −25%#D33423

Channel breakdown

R242

G27

Red242 (94.9%)

Green27 (10.6%)

Blue4 (1.6%)

Hue5.8°

Saturation (HSL)96.75%

Lightness48.24%

Dominant channelRed

Hex per channelR F2 · G 1B · B 04

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#F21B04

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

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