Re: relative colorimetric without black point compensation
Re: relative colorimetric without black point compensation
- Subject: Re: relative colorimetric without black point compensation
- From: Graeme Gill <email@hidden>
- Date: Sun, 25 Jan 2009 15:36:23 +1100
Marco Ugolini wrote:
Also, without claiming fully to understand the underlying mechanism, it
looks to me as if RelCol + BPC is often not clipping as much as we are told
it is supposed to, and instead performs a fair amount of re-mapping even of
out-of-gamut detail.
We aren't very sensitive to clipping in saturated colors (something
that can be viewed as a shortcoming of the perceptual linearity
of L*a*b* space, and is reflected in DeltaE2000 etc.), and there is
another effect that often comes into play, and that is that the finite
resolution of a 3D grid sampling tends to "round off" the mapping in
the last cell. This depends on where the saturation point falls in
the cell, having most effect if it falls exactly in the center of
a cell, and no effect if the grid coincides with the saturation point.
This "rounding off" is more pronounced at lower grid resolutions.
Graeme Gill.
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