[argyllcms] Re: Profiling flexo presses
- From: Roberto Michelena <colorsync@xxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Tue, 23 Aug 2005 09:24:55 -0500
> The relatively fixed or arbitrary interpolation
> between the sampling points ignores any knowledge about the
> typical, reasonable or desirable behaviour of the device between
> sampling points. In addition there are issues with trying
> to get reasonable extrapolated results, something that
> often crops up in scanner profiling.
Actually I always wondered why are the interpolation algorithms not
parametric, adjustable per a device model for better precision...
Even without a previous device model; for example after reading a
chart of 4096 patches, instead of building a table with 4096
gridpoints and a simplistic interpolation between them, use the
"in-between" patches for tuning the interpolation algorithm via some
parameters, and then build a table with fewer gridpoints (or maybe
even the same 4096) but additional data to drive the interpolation.
A gridpoint might have, for example, one more byte defining a 'sphere
of influence'. Or maybe a vector defining an ellipse of influence
centered on the gridpoint. Or maybe a vector plus a linear offset
value so that the ellipse is not centered. Etc etc. ; Maybe a single
byte defining a 'density of space' at the gridpoint. I'm no
matematician, but I guess there are ways to go beyond blind
interpolation....
-- Roberto
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