Created using following matrices of size mx3n for RGB
R( z=[e(z7)/e(z5) * e(z2)/e(z1)])
G(( z=[e(z7)/e(z2) * e(z7)/e(z1)])
B( z=[e(z7)/e(z5) / e(z2)/e(z1)])
on a complex plain [-x:x, -yi:yi]
and transformed with cegl operation (you can see non transformed image in my cover)