> Date: Sun, 17 Feb 2008 14:35:20 +0100> From: [EMAIL PROTECTED]> To:
> lcms-user@lists.sourceforge.net> Subject: Re: [Lcms-user] build printer
> profile - LUT B2A> > Guy K. Kloss wrote:> > On Sun, 17 Feb 2008 12:03:06 pm
> Alastair M. Robinson wrote:> > > >> Unless you especially want to do the
> programming for this yourself, you> >> might find that ArgyllCMS is a better
> fit for your needs - it has a> >> complete workflow for profiling, and with a
> bit of spreadsheet work it's> >> easy enough to use an arbitrary set of data
> points.> >> > >> > On that matter ...> >> > Is there somewhere in a
> publication or on some web site the algorithm > > documented on how to go
> about for creating a LUT based ICC profile from patch > > measurement data?>
> > > > "The algoritm" does not exist. There are many ways to do it. Basically>
> you need to fit a mathematical model of the device behavior to the data>
> points in order to determine the model parameters, and then you can> evaluate
> this model at each CLUT grid point in order to fill the CLUT.> If you have no
> a priori knowledge that the device behavior can be> expected to follow a very
> particular mathematical model, then> non-parametric regression is basically
> the way to go. And there are also> many ways to do a non-parametric
> regression, e.g. multivariate> polynomials, multivariate splines, radial
> basis function networks,> neural networks, etc. Another exercise is building
> the> perceptual/saturation tables and the reverse (B2A) tables, since this>
> additionally involves gamut mapping and the inversion of the fitted> model.
> All in all this involves loads of mathematics, and additionally> some art for
> finding a pleasing gamut mapping...> > Regards,> Gerhard> > >
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