munsellinterpol (version 3.0-0)

ColorBlockFromMunsell: Get ISCC-NBS Number and ISCC-NBS Name from Munsell HVC or Munsell Notation

Description

Get ISCC-NBS Number and ISCC-NBS Name from Munsell HVC or Munsell Notation.

Usage

ColorBlockFromMunsell( MunsellSpec )

Arguments

MunsellSpec

a numeric Nx3 matrix or a vector that can be converted to such a matrix. Each row has Munsell HVC, where H is Hue Number, and V and C are the standard Munsell Value and Chroma. The Hue is automatically wrapped to the interval (0,100]. MunsellSpec can also be a character N-vector with standard Munsell notation; it is converted to an Nx3 matrix.

Value

a data.frame with N rows and these columns:

HVC

the input Nx3 matrix, or such a matrix converted from Munsell notation

Number

the corresponding ISCC-NBS color number - an integer from 1 to 267

Name

the corresponding ISCC-NBS color name - a character string

Centroid

the centroid of the block in Munsell Notation - a character string; see CentroidsISCCNBS

The rownames are set to the input MunsellSpec.

History

The Munsell Book of Color was published in 1929. The first ISCC-NBS partition, in 1939, had 319 blocks and names (including 5 neutrals). There were no block numbers. The aimpoints of the Munsell samples were thoroughly revised in 1943. The ISCC-NBS partition was revised in 1955, and this is the version used here.

Future Work

It might be useful to compute the distance from the query point to the boundary of the containing color block.

Details

The ISCC-NBS System is a partition of Munsell Color Solid into 267 color blocks. Each block is a disjoint union of elementary blocks, where an elementary block is defined by its minimum and maximum limits in Hue, Value, and Chroma. Some blocks are non-convex. The peripheral blocks, of which there are 120, have arbitrary large chroma and are considered semi-infinite for this function; there is no consideration of the MacAdam limits. For each query vector HVC, the function searches a private data.frame with 932 elementary blocks, for the one elementary block that contains it.

References

Munsell Color Company, A.H. Munsell, and A.E.O. Munsell. Munsell book of color: defining, explaining, and illustrating the fundamental characteristics of color. 1929.

Judd, Deane B. and Kenneth L. Kelly. Method of Designating Colors. Journal of Research of the National Bureau of Standards. Research Paper 1239. Volume 23 Issue 3. pp. 355-385. September 1939.

Newhall, Sidney M., Dorothy Nickerson, Deane B. Judd. Final Report of the O.S.A. Subcommitte on the Spacing of the Munsell Colors. Journal of the Optical Society of America. Vol. 33. No. 7. pp. 385-418. July 1943.

Kelly, Kenneth L. and Deane B. Judd The ISCC-NBS Method of Designating Colors and a Dictionary of Color Names. National Bureau of Standards Circular 553. Washington DC: US Government Printing Office. November 1, 1955.

See Also

CentroidsISCCNBS

Examples

# NOT RUN {
ColorBlockFromMunsell( c( "3R 8/3", "7.4YR 3/4" ) )

##            HVC.H HVC.V HVC.C Number           Name      Centroid
##  3R 8/3      3.0   8.0   3.0      4     light pink  2.5R 8.6/5.2
##  7.4YR 3/4  17.4   3.0   4.0     58 moderate brown 5.5YR 3.5/3.9
# }