Colour

#1F0004

#1F0004
Red
Dark
Nearest: Black

#1F0004 is a red with RGB values 31, 0, 4 and HSL 352°, 100%, 6%. It is a dark colour, so white text on it reaches 19.8:1 contrast (AAA for normal text). The nearest named colour is Black.

Colour values

#1F0004#1F0004

HEX#1F0004

RGBrgb(31, 0, 4)

RGB (0–1)0.1216, 0, 0.0157

RGB percentages12.2%, 0%, 1.6%

HSLhsl(352.3, 100%, 6.1%)

HSV / HSBhsv(352.3, 100%, 12.2%)

CMYK0%, 100%, 87.1%, 87.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,031,620

CSS custom property--colour: #1F0004;

Brightness & contrast

Relative luminance0.003WCAG 2.x, 0 is black and 1 is white

Perceived brightness17 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundWhitecontrast 19.81:1

Contrast with white19.81:1WCAG normal text: AAA

Contrast with black1.06:1WCAG normal text: Fail

Greyscale equivalent#070707

Inverted#E0FFFB

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#060604no red cones; affects about 1% of men; ΔE 12.8 from the original

Deuteranopia#0F0D03no green cones; the most common form, about 1% of men; ΔE 13.2 from the original

Tritanopia#230001no blue cones; rare, and affects men and women equally; ΔE 3.1 from the original

Distinguishable without hueYesnever rely on hue alone to carry meaning

Contrast with white, large text19.81:1WCAG large text: AAA

Contrast with black, large text1.06:1WCAG large text: Fail

Named colours

Black · ΔE 12.9 Dark slate grey · ΔE 37.9 Dim grey · ΔE 43.6 Gray · ΔE 52.4 Saddle brown · ΔE 53.6 Slate grey · ΔE 53.8

Nearest named CSS colourBlack (#000000)ΔE 12.93, a distinctly different colour

Hue familyred

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#001F1B

Analogous#1F0013, #1F0B00

Triadic#041F00, #00041F

Split complementary#001F0B, #00141F

Tetradic#141F00, #001F1B, #0C001F

Tints, shades & saturation

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

Lighter +40%#EB001E

Lighter +30%#B80018

Lighter +20%#850011

Lighter +10%#52000B

Darker −10%#000000

Darker −20%#000000

Darker −30%#000000

Darker −40%#000000

More saturated +25%#1F0004

Less saturated −25%#1B0407

Channel breakdown

R31

Red31 (12.2%)

Green0 (0%)

Blue4 (1.6%)

Hue352.26°

Saturation (HSL)100%

Lightness6.08%

Dominant channelRed

Hex per channelR 1F · G 00 · B 04

Keep nerding

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#1F0004

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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