International Klein Blue

#0728AD

About International Klein Blue

International Klein Blue (IKB), with the hex code #0728ad, is a deep ultramarine blue hue that was developed and patented by the French artist Yves Klein. This specific shade of blue is renowned for its striking intensity and unique matte finish. Klein sought to capture the purest expression of blue, believing it represented the infinite and the immaterial. IKB achieves its distinctive visual impact through a special synthetic resin binder that allows the pigment to retain its maximum brilliance and luminosity. This color has become synonymous with Klein's artistic vision and is prominently featured in his monochrome paintings and sculptures. The color is visually perceived as an ultramarine color which, when describing in the RGB color model, consists of 0.2% red, 15.7% green and 67.8% blue.

The hex color #0728ad, also known as International Klein Blue, presents some accessibility challenges, particularly in text applications. Due to its dark hue and relatively low luminance, it necessitates careful consideration of contrast ratios when paired with text or other interactive elements. According to WCAG guidelines, sufficient contrast between foreground and background colors is crucial for users with visual impairments to perceive content effectively. For standard text sizes, a contrast ratio of at least 4.5:1 is recommended, while larger text sizes require a ratio of 3:1. When using #0728ad as a background color, it's imperative to select a light-colored text to meet these contrast requirements. White or light gray are potential choices, but it's always best to verify the contrast ratio using an online tool to ensure compliance. Failure to provide adequate contrast can render content inaccessible to a significant portion of users.

Shades

Digital Color Formats

RGB
7 40 173
RGB7 40 173
Red
Green
Blue
HSL
228.07deg 92.22% 35.29%
228.0792.2235.29HSL
Hue
Saturation
Lightness
HWB
228.07deg 2.75% 32.16%
228.072.7532.16HWB
Hue
Whiteness
Blackness
hex#0728AD
rgb7 40 173
hsl228.07deg 92.22% 35.29%
cmyk95.95% 76.88% 0% 32.16%
hwb228.07deg 2.75% 32.16%
xyz-d650.08 0.05 0.4
oklch0.3757 0.2088 264.72
oklab0.3757 -0.02 -0.21
CMYK
95.95% 76.88% 0% 32.16%
95.9576.88032.16CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.08 0.05 0.4
0.080.050.4XYZ
X
Y
Z
OKLCH
0.3757 0.2088 264.72
0.37570.2088264.72LCH
Lightness
Chroma
Hue
OKLAB
0.3757 -0.02 -0.21
0.3757-0.02-0.21LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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