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Colour

#EF5B00

  • #EF5B00
  • Orange
  • Dark
  • Nearest: Orange red

#EF5B00 is a orange with RGB values 239, 91, 0 and HSL 23°, 100%, 47%. It is a dark colour, so black text on it reaches 6.2:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#EF5B00#EF5B00
HEX#EF5B00
RGBrgb(239, 91, 0)
RGB (0–1)0.9373, 0.3569, 0
RGB percentages93.7%, 35.7%, 0%
HSLhsl(22.8, 100%, 46.9%)
HSV / HSBhsv(22.8, 100%, 93.7%)
CMYK0%, 61.9%, 100%, 6.3%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer15,686,400
CSS custom property--colour: #EF5B00;

Brightness & contrast

Relative luminance0.25833WCAG 2.x, 0 is black and 1 is white
Perceived brightness148.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 6.17:1
Contrast with white3.41:1WCAG normal text: Fail
Contrast with black6.17:1WCAG normal text: AA
Greyscale equivalent#747474
Inverted#10A4FF

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#877600no red cones; affects about 1% of men; ΔE 60.1 from the original
Deuteranopia#AB9800no green cones; the most common form, about 1% of men; ΔE 60.4 from the original
Tritanopia#FF304Eno blue cones; rare, and affects men and women equally; ΔE 38.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.41:1WCAG large text: AA
Contrast with black, large text6.17:1WCAG large text: AAA

Named colours

Orange red · ΔE 13.7Chocolate · ΔE 20.3Tomato · ΔE 21.9Dark orange · ΔE 22.3Coral · ΔE 23.8Red · ΔE 26.3
Nearest named CSS colourOrange red (#FF4500)ΔE 13.69, a distinctly different colour
Hue familyorange
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#0094EF
Analogous#EF001C, #EFD200
Triadic#00EF5B, #5B00EF
Split complementary#00EFD2, #001DEF
Tetradic#1DEF00, #0094EF, #D300EF

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFD6BC
Lighter +30%#FFB689
Lighter +20%#FF9656
Lighter +10%#FF7723
Darker −10%#BC4800
Darker −20%#893400
Darker −30%#562100
Darker −40%#230D00
More saturated +25%#EF5B00
Less saturated −25%#D1621E

Channel breakdown

R239
G91
B0
Red239 (93.7%)
Green91 (35.7%)
Blue0 (0%)
Hue22.85°
Saturation (HSL)100%
Lightness46.86%
Dominant channelRed
Hex per channelR EF · G 5B · B 00

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Every value on this page was computed from “ef5b00” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.