International Klein Blue

#0728B4

About International Klein Blue

International Klein Blue (IKB), represented by the hexadecimal color code #0728B4, is a deep and vivid shade of blue that was developed and patented by the French artist Yves Klein. This ultramarine blue is renowned for its unique intensity and purity, achieved through a specific mixture of pigment and a synthetic resin binder. Klein sought to capture the essence of the sky and the infinite, and IKB became a defining element of his artistic expression. The color is often associated with spirituality, depth, and a sense of the sublime. It has been widely used in art, fashion, and design to evoke a sense of wonder and contemplation. The color is unique in its matte finish, making it appear intensely saturated.

The hex color #0728b4, also known as International Klein Blue, presents significant accessibility challenges. Its extremely low luminance contrasts poorly with both white and black text, making it difficult to read for users with visual impairments. According to WCAG guidelines, it fails the contrast ratio test for normal text sizes against both white and black backgrounds. To improve accessibility, consider using a lighter shade of blue or pairing it with a very light or dark color to meet minimum contrast requirements. When employing this color, be sure to provide alternative text or visual cues to convey important information, ensuring that all users can access the content effectively. Using a color contrast checker is highly recommended to validate the contrast ratio before deploying the design.

Shades

Digital Color Formats

RGB
7 40 180
RGB7 40 180
Red
Green
Blue
HSL
228.55deg 92.51% 36.67%
228.5592.5136.67HSL
Hue
Saturation
Lightness
HWB
228.55deg 2.75% 29.41%
228.552.7529.41HWB
Hue
Whiteness
Blackness
hex#0728B4
rgb7 40 180
hsl228.55deg 92.51% 36.67%
cmyk96.11% 77.78% 0% 29.41%
hwb228.55deg 2.75% 29.41%
xyz-d650.09 0.05 0.44
oklch0.3839 0.217 264.74
oklab0.3839 -0.02 -0.22
CMYK
96.11% 77.78% 0% 29.41%
96.1177.78029.41CMYK
Cyan
Magenta
Yellow
Key
XYZ-d65
0.09 0.05 0.44
0.090.050.44XYZ
X
Y
Z
OKLCH
0.3839 0.217 264.74
0.38390.217264.74LCH
Lightness
Chroma
Hue
OKLAB
0.3839 -0.02 -0.22
0.3839-0.02-0.22LAB
Lightness
Green-Red
Blue-Yellow

Alternative colors

Applications

Complementary color

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