International Klein Blue

#0337B0

About International Klein Blue

International Klein Blue, often abbreviated as IKB, is a deep blue hue first mixed by the French artist Yves Klein. IKB's visual impact comes from its heavy reliance on ultramarine, as well as Klein's matte, synthetic resin binder which suspends the color pigment and allows the pigment to maintain its original qualities. The color is a specific shade of blue achieved by mixing pure ultramarine pigment with a special binder. IKB is recognized for its intense saturation and unique visual properties. Yves Klein registered this color as a trademark in 1957, although the trademark has since expired.

The hex color #0337B0, also known as International Klein Blue, presents several accessibility considerations for web developers. Its dark hue results in a high contrast ratio against white text, making it easily readable for most users, including those with visual impairments. However, when paired with darker colors, the contrast may become insufficient, posing challenges for readability. According to WCAG guidelines, a contrast ratio of at least 4.5:1 is recommended for standard text and 3:1 for large text. Developers should utilize contrast checker tools to ensure compliance. Additionally, relying solely on color to convey information should be avoided. Incorporating text labels, icons, or patterns alongside the color can enhance accessibility for users with color vision deficiencies.

Shades

Digital Color Formats

RGB
3 55 176
RGB3 55 176
Red
Green
Blue
HSL
221.97deg 96.65% 35.1%
221.9796.6535.1HSL
Hue
Saturation
Lightness
HWB
221.97deg 1.18% 30.98%
221.971.1830.98HWB
Hue
Whiteness
Blackness
hex#0337B0
rgb3 55 176
hsl221.97deg 96.65% 35.1%
cmyk98.3% 68.75% 0% 30.98%
hwb221.97deg 1.18% 30.98%
xyz-d650.09 0.06 0.42
oklch0.4026 0.1973 263.08
oklab0.4026 -0.02 -0.2
CMYK
98.3% 68.75% 0% 30.98%
98.368.75030.98CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.06 0.42
0.090.060.42XYZ
X
Y
Z
OKLCH
0.4026 0.1973 263.08
0.40260.1973263.08LCH
Lightness
Chroma
Hue
OKLAB
0.4026 -0.02 -0.2
0.4026-0.02-0.2LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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