Algorithm 1.

Create 2D transfer function t f from 1D transfer functions dist and data using blend parameter t. LERP is linear interpolation with the interpolant as the last argument.

1: for all (i, j) do

2:   κ ← dist[j]A

3:   t f[i, j]RGB ← LERP(data[i]RGB, dist[j]RGB, dist[j]A)

4:   t f[i, j]A ← LERP(t * data[i]A, data[i]A * dist[j]A, κ)

5: end for