LAB                package:colorspace                R Documentation

_C_r_e_a_t_e _L_A_B _C_o_l_o_r_s

_D_e_s_c_r_i_p_t_i_o_n:

     This function creates colors of class ``LAB''; a subclass of the
     virtual ``color'' class.

_U_s_a_g_e:

     LAB(L, A, B, names)

_A_r_g_u_m_e_n_t_s:

   L,A,B: these arguments give the L, A and B coordinates of the
          colors.  The values can be provided in separate 'L', 'A' and
          'B' vectors or in a three-column matrix passed as 'L'.

   names: a vector of names for the colors (by default the row names of
          'L' are used).

_D_e_t_a_i_l_s:

     The 'L', 'A' and 'B' values give the coordinates of the colors in
     the CIE L*a*b* space. This is a transformation of the 1931 CIE XYZ
     space which attempts to produce perceptually based axes. Luminance
     takes values between 0 and 100, and the other coordinates take
     values between -100 and 100.  The a and b coordinates measure
     positions on green/red and blue/yellow axes.

_V_a_l_u_e:

     An object of class ``LAB'' which inherits from class ``color.''

_A_u_t_h_o_r(_s):

     Ross Ihaka

_S_e_e _A_l_s_o:

     'RGB', 'HSV', 'XYZ', 'LAB', 'polarLAB', 'LUV', 'polarLUV'.

_E_x_a_m_p_l_e_s:

     ## Show the LAB space
     x = RGB(runif(1000), runif(1000), runif(1000))
     plot(as(x,"LAB"))

