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Search Knowledge Base Knowledge Base - Glossary of Terms
Glossary is usually defined as an alphabetical list of technical terms in some specialized field of knowledge. This knowledge base glossary provides a collection of knowledge base documents that define many technical terms. These terms are arranged alphabetically, but you can quickly jump to a specific term by selecting its first letter from the index of the knowledge base glossary below.
 
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14 Glossary Terms Found
D65 / D6500
A standard daylight illuminant. It refers to the spectral power distribution curve of a daylight illuminant having a correlated color temperature of 6500K.

Da, Delta A
Difference in red-green component. In certain transformed color spaces, generally used as the Da, or difference between a sample and a standard reference color along the redness-greenness axis. It is always calculated for a specific Illuminant/Observer condition. If "a" or Da is plus, the sample has more redness than greenness than the standard. If "a" or Da is minus, there is more greenness than redness. It is normally used with b to express the chromaticity or chromaticity differences between samples. Da* is the redness-greenness differences calculated using the 1976 CIEL*a*b* color difference calculation. Da is the redness-greenness differences calculated using the Hunter Lab color difference calculation. • +Da. More red (less green) • -Da. More green (less red)

Db / Delta b
Difference in yellow-blue component. In certain transformed color spaces, generally used as Db, the difference in "b" between a sample and a standard reference color along the yellowness-blueness axis. It is always calculated for a specific Illuminant/Observer condition. Generally, if "b" is plus, there is more yellowness than blueness, if "b" is minus, there is more blueness than yellowness. . It is normally used with "a" to express the chromaticity or chromaticity differences between the samples. Db* is the yellowness-blueness differences calculated using the 1976 CIEL*a*b* color difference calculation. Db is the yellowness-blueness differences calculated using the Hunter Lab color difference calculation. • +Db. More yellow (less blue) • -Db. More blue (less yellow)

DC* / Delta C
Difference in chroma. In certain transformed color spaces, generally used as DC, the differences in chroma or chromaticity between a sample and a standard. It is always calculated for a specific Illuminant/Observer condition. The concept of chroma is used in CIEL*a*b* color difference calculation, and is expressed as deviation from gray, excluding the luminous intensity of the samples. • +C. Sample has higher chroma • -C. Sample has lower chroma.

DE (Delta E)
Total color difference, computed by all color difference equations. It is always calculated for a specific Illuminant/Observer condition. The interpretation of this number is directed related to the color difference equation used to calculate it. DE is always a positive value.

Density
Density is weight per volume. It is a number used to convert ingredient amounts from a weight form to an equivalent volume form, and vice versa. The specific gravity of an ingredient is one example of a density value. It is expressed as single number that represents the weight of the material per unit volume; for example grams/cc, lbs/Gal, KG/L, etc. The user can create a density using a combination of any defined weight unit and any defined volume unit.

DH* / Delta H*
Difference in hue. In certain transformed color spaces, a parameter used to express the differences between the sample and the standard along the hue axis/circle. It is always calculated for a specific Illuminant/Observer condition. Typically, differences in hue have the greatest impact on the visual evaluation of colored samples. • +DH. Sample is moving from standard counter-clockwise around the hue circle. • -DH. Sample is moving from standard clockwise around the hue circle.

DL / Delta L
Difference in lightness. In certain transformed color spaces, generally used as DL to express the differences between the sample and the standard along the achromatic dimension in a three dimensional color space. This axis ranges from black through various levels of gray to white. It is always calculated for a specific Illuminant/Observer condition. This expression is included in all color difference calculations. • +DL. Sample is lighter • -DL. Sample is darker

Dry (colorant)
Colorant in the physical form of a powder.

Dye class
Classification of dyes according to the chemical composition and reaction, e.g., disperse, reactive.

Dye fiber group
Group of fibers dyed in the same bath with the same dyestuffs, e.g. Cotton/Viscose.

Dye process
The dye process contains Dye class, Process type and Process factor. The dye process is associated with combined process and colorant set.

Dye strength
The attribute of color which increases the concentration of the Colorant, all other conditions remaining the same.

Dyestuff type
Description of the dyestuff, e.g. gran., conc., supra. The dyestuff type is used to specify the dyestuff name.

 
     

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