For blending two color transformation look-up tables, the weights used for combining the tables are designed such that transitions from one look-up table to another are smooth and do not create objectionable artifacts. Building the individual weights includes obtaining the position of a given input point from the input color space, both in the input device and an output device gamut. Weight calculation is obtained by (1) if the input color falls in the intersection of predefined percentages of both the input gamut and the output gamut, then a pictorial LUT is used and the weight is set to 1.0; (2) if the input color falls outside the input and/or output gamut, then a graphics LUT is used and the weight is set to 1.0, but if the input color is inside the predefined percentage of the output gamut and anywhere inside the input gamut, a weight is calculated according to the position of the input color relative to the input gamut; (3) if the input color is inside the output gamut but outside the predefined percentage of the output gamut, and inside the input gamut, a test is used to determine if the input color is in the predefined percentage of the input gamut. When the restrictions of (3) are met, a weight is calculated according to the position of the input color relative to the output gamut; however when the restrictions of (3) are not met a weight is calculated according to the position of the input color relative to both the input and output gamut.