Colour

#EF0A00

#EF0A00
Red
Dark
Nearest: Red

#EF0A00 is a red with RGB values 239, 10, 0 and HSL 3°, 100%, 47%. It is a dark colour, so black text on it reaches 4.7:1 contrast (AA for normal text). The nearest named colour is Red.

Colour values

#EF0A00#EF0A00

HEX#EF0A00

RGBrgb(239, 10, 0)

RGB (0–1)0.9373, 0.0392, 0

RGB percentages93.7%, 3.9%, 0%

HSLhsl(2.5, 100%, 46.9%)

HSV / HSBhsv(2.5, 100%, 93.7%)

CMYK0%, 95.8%, 100%, 6.3%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer15,665,664

CSS custom property--colour: #EF0A00;

Brightness & contrast

Relative luminance0.18568WCAG 2.x, 0 is black and 1 is white

Perceived brightness130.9 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 4.71:1

Contrast with white4.46:1WCAG normal text: Fail

Contrast with black4.71:1WCAG normal text: AA

Greyscale equivalent#3A3A3A

Inverted#10F5FF

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#675A00no red cones; affects about 1% of men; ΔE 82.1 from the original

Deuteranopia#998700no green cones; the most common form, about 1% of men; ΔE 80.9 from the original

Tritanopia#FF0012no blue cones; rare, and affects men and women equally; ΔE 5.8 from the original

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

Contrast with white, large text4.46:1WCAG large text: AA

Contrast with black, large text4.71:1WCAG large text: AAA

Named colours

Red · ΔE 6.3 Orange red · ΔE 11.8 Tomato · ΔE 27.7 Crimson · ΔE 31 Firebrick · ΔE 34.7 Coral · ΔE 38.4

Nearest named CSS colourRed (#FF0000)ΔE 6.33, clearly different but related

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#00E5EF

Analogous#EF006D, #EF8200

Triadic#00EF0A, #0A00EF

Split complementary#00EF81, #006EEF

Tetradic#6EEF00, #00E5EF, #8100EF

Tints, shades & saturation

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

Lighter +40%#FFBFBC

Lighter +30%#FF8E89

Lighter +20%#FF5D56

Lighter +10%#FF2C23

Darker −10%#BC0800

Darker −20%#890600

Darker −30%#560400

Darker −40%#230100

More saturated +25%#EF0A00

Less saturated −25%#D1251E

Channel breakdown

R239

G10

Red239 (93.7%)

Green10 (3.9%)

Blue0 (0%)

Hue2.51°

Saturation (HSL)100%

Lightness46.86%

Dominant channelRed

Hex per channelR EF · G 0A · B 00

Keep nerding

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

#EF0A00

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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