Colour

#FF5311

#FF5311
Orange
Dark
Nearest: Orange red

#FF5311 is a orange with RGB values 255, 83, 17 and HSL 17°, 100%, 53%. It is a dark colour, so black text on it reaches 6.5:1 contrast (AA for normal text). The nearest named colour is Orange red.

Colour values

#FF5311#FF5311

HEX#FF5311

RGBrgb(255, 83, 17)

RGB (0–1)1, 0.3255, 0.0667

RGB percentages100%, 32.5%, 6.7%

HSLhsl(16.6, 100%, 53.3%)

HSV / HSBhsv(16.6, 93.3%, 100%)

CMYK0%, 67.5%, 93.3%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer16,732,945

CSS custom property--colour: #FF5311;

Brightness & contrast

Relative luminance0.27487WCAG 2.x, 0 is black and 1 is white

Perceived brightness153.4 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.5:1

Contrast with white3.23:1WCAG normal text: Fail

Contrast with black6.5:1WCAG normal text: AA

Greyscale equivalent#737373

Inverted#00ACEE

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#877700no red cones; affects about 1% of men; ΔE 69.2 from the original

Deuteranopia#B19D00no green cones; the most common form, about 1% of men; ΔE 69.1 from the original

Tritanopia#FF0A49no blue cones; rare, and affects men and women equally; ΔE 35.9 from the original

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

Contrast with white, large text3.23:1WCAG large text: AA

Contrast with black, large text6.5:1WCAG large text: AAA

Named colours

Orange red · ΔE 5.7 Red · ΔE 18.2 Tomato · ΔE 20.9 Coral · ΔE 27.1 Chocolate · ΔE 27.9 Dark orange · ΔE 29.4

Nearest named CSS colourOrange red (#FF4500)ΔE 5.74, clearly different but related

Hue familyorange

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#11BDFF

Analogous#FF1146, #FFCA11

Triadic#11FF53, #5311FF

Split complementary#11FFCA, #1146FF

Tetradic#46FF11, #11BDFF, #CA11FF

Tints, shades & saturation

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

Lighter +40%#FFE6DD

Lighter +30%#FFC2AA

Lighter +20%#FF9D77

Lighter +10%#FF7844

Darker −10%#DD3D00

Darker −20%#AA2F00

Darker −30%#772100

Darker −40%#441300

More saturated +25%#FF5311

Less saturated −25%#E1602F

Channel breakdown

R255

G83

B17

Red255 (100%)

Green83 (32.5%)

Blue17 (6.7%)

Hue16.64°

Saturation (HSL)100%

Lightness53.33%

Dominant channelRed

Hex per channelR FF · G 53 · B 11

Keep nerding

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#FF5311

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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