JIS Z 8721 PDF: The Ultimate Resource for Colour Professionals
JIS Z 8721: A Standard for Color Specification
Color is one of the most important elements in design, art, and communication. It can convey meaning, emotion, mood, and style. However, color perception can vary depending on factors such as lighting, viewing angle, background, and personal preference. Therefore, it is essential to have a standard way of specifying colors that can be understood and reproduced by everyone.
One such standard is JIS Z 8721, which is a Japanese Industrial Standard (JIS) for color specification. It is based on the Munsell color system, which is a widely used and accepted system for describing colors in terms of three attributes: hue, value, and chroma. In this article, we will explain what these attributes are, how they are measured and notated, and how they can be used to specify colors using JIS Z 8721. We will also show you some examples of color specification using JIS Z 8721 notation and their corresponding Munsell notation and RGB values. Finally, we will discuss the benefits of using JIS Z 8721 for color specification and how you can download the JIS Z 8721 PDF for free from a reliable website.
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Hue, Value, and Chroma: The Three Attributes of Color Specification
The three attributes of color specification according to JIS Z 8721 are hue, value, and chroma. These attributes are defined as follows:
Hue: The attribute that describes the color name or category
Hue is the attribute that describes the color name or category, such as red, yellow, green, blue, purple, etc. It is determined by the dominant wavelength of light reflected or transmitted by an object. Hue can be measured using a device called a spectrophotometer, which analyzes the spectral composition of light.
However, since hue is also a subjective perception that depends on human vision, it can also be measured using a visual method called the Munsell color system. The Munsell color system is a three-dimensional model that represents colors as points in a spherical space. The hue axis runs around the equator of the sphere, dividing it into ten equal segments. Each segment corresponds to a hue name: red (R), yellow-red (YR), yellow (Y), green-yellow (GY), green (G ), blue-green (BG), blue (B), purple-blue (PB), purple (P), and red-purple (RP). Each hue segment is further divided into 10 steps, numbered from 1 to 10, indicating the variation of hue within the segment. For example, 5R is the middle of the red segment, while 2.5YR is a yellow-red hue closer to red than to yellow.
JIS Z 8721 uses the same hue names and numbers as the Munsell color system, but with a different notation. Instead of using a decimal point, JIS Z 8721 uses a dash to separate the hue segment and the hue step. For example, 5R in Munsell notation is written as 5-R in JIS Z 8721 notation. JIS Z 8721 also adds a prefix "J" to indicate that it is a JIS standard. For example, J5-R is the JIS Z 8721 notation for the hue 5R in Munsell notation.
Value: The attribute that describes the lightness or darkness of a color
Value is the attribute that describes the lightness or darkness of a color, regardless of its hue or chroma. It is determined by the amount of light reflected or transmitted by an object. Value can be measured using a device called a colorimeter, which analyzes the luminance or brightness of light.
However, since value is also a subjective perception that depends on human vision, it can also be measured using a visual method called the Munsell color system. The Munsell color system represents value as the vertical axis of the spherical model, running from black at the bottom (value 0) to white at the top (value 10). Each value level is divided into 10 steps, numbered from 0 to 10, indicating the variation of value within the level. For example, value 5 is the middle of the value scale, while value 2 is a dark value closer to black than to white.
JIS Z 8721 uses the same value numbers as the Munsell color system, but with a different notation. Instead of using a slash, JIS Z 8721 uses a colon to separate the value number and the hue notation. For example, 5/5R in Munsell notation is written as 5:J5-R in JIS Z 8721 notation.
Chroma: The attribute that describes the saturation or purity of a color
Chroma is the attribute that describes the saturation or purity of a color, or how much it differs from a neutral gray of the same value. It is determined by the amount of hue present in a color. Chroma can be measured using a device called a colorimeter, which analyzes the saturation or intensity of light.
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However, since chroma is also a subjective perception that depends on human vision, it can also be measured using a visual method called the Munsell color system. The Munsell color system represents chroma as the radial distance from the center of the spherical model, where neutral gray colors are located, to the surface of the sphere, where pure colors are located. Each chroma level is divided into even steps, numbered from 0 to any number depending on the hue and value. For example, chroma 0 is neutral gray, while chroma 10 is a pure color with no grayness.
JIS Z 8721 uses the same chroma numbers as the Munsell color system, but with a different notation. Instead of using a slash, JIS Z 8721 uses a dash to separate the chroma number and the value notation. For example, 5/10/5R in Munsell notation is written as 10-5:J5-R in JIS Z 8721 notation.
Examples of Color Specification Using JIS Z 8721
Now that we have explained what hue, value, and chroma are and how they are measured and notated using JIS Z 8721, let us see some examples of color specification using JIS Z 8721 notation and their corresponding Munsell notation and RGB values.
To read and write a color specification using JIS Z 8721 notation, we need to follow this format: chroma-value:hue. For example, <stron