Here is an example of a rendering of Stephen Hawking’s photograph that uses star flickering (rendering needs to be improved).
(source https://i2-prod.mirror.co.uk/incoming/article9569949.ece/ALTERNATES/s615/Stephen-Hawking.jpg )
:o)
-n[-1] 128,255
-to_pseudogray[-1] 5,1,8
-blur[-1] 2
-isophotes[-1] 6
{w},{h},1,4
-repeat {{{w}+{h}}/2}
-line[-1] {u(100)}%,{u(100)}%,{u(100)}%,{u(100)}%,1,255,255,255,255
-line[-1] {u(100)}%,{u(100)}%,{u(100)}%,{u(100)}%,1,0,0,0,0
-point {u(100)}%,{u(100)}%,0,1,255,255,255,255
-done
-and[-1,-2]
-i [-1]
-i [-1]
-dilate_circ[-3] 2
-dilate[-2] 6,1
-dilate[-1] 1,6
-blend[-1,-2,-3] alpha
