[Lcms-user] Question related to curve smoothing

[Leandro R. <lea...@ri...>]

Hello,

Based on [1], we've added the code to decompose a cmsHTRANSFORM into a
shaper (3x1D LUT) + 3D LUT on Weston [2].

We want to smooth the shaper with cmsSmoothToneCurve(), but we don't know
exactly how to choose the lambda parameter. In [1] we have: "lambda is a
parameter by which we can trade smoothness of z against fit to data y". But
would there be any drawback in using lambda == 0, i.e. allowing "full
smoothness"?

Any feedback from your experience with that would be appreciated.

[1] https://www.littlecms.com/ASICprelinerization_CGIV08.pdf
[2] https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/1644

Thanks,
Leandro Ribeiro