set color lookup table parameters
glColorTableParameter is used to specify the scale factors and bias terms applied to color components when they are loaded into a color table. target indicates which color table the scale and bias terms apply to; it must be set to GL_COLOR_TABLE , GL_POST_CONVOLUTION_COLOR_TABLE , or GL_POST_COLOR_MATRIX_COLOR_TABLE .
pname must be GL_COLOR_TABLE_SCALE to set the scale factors. In this case, params points to an array of four values, which are the scale factors for red, green, blue, and alpha, in that order.
pname must be GL_COLOR_TABLE_BIAS to set the bias terms. In this case, params points to an array of four values, which are the bias terms for red, green, blue, and alpha, in that order.
The color tables themselves are specified by calling glColorTable .
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