Color to BGR Conversion

R color to BRG (blue/green/red) conversion.

col2bgr(col, alpha = FALSE)

Arguments

col	Vector of any of the three kinds of R color specifications, i.e., either a color name (as listed by colors()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see rgb), or a positive integer i meaning palette()[i].
alpha	Logical value indicating whether the alpha channel (opacity) values should be returned.

Value

An integer matrix with three or four (for alpha = TRUE) rows and number of columns the length of col. If col has names these are used as the column names of the return value.

Details

NA (as integer or character) and "NA" mean transparent.

Values of col not of one of these types are coerced: real vectors are coerced to integer and other types to character. (factors are coerced to character: in all other cases the class is ignored when doing the coercion.)

Zero and negative values of col are an error.

See also

col2rgb, rgb, palette

Author

Simon Garnier, garnier@njit.edu

Examples

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