gnu.java.awt.color
Class ToneReproductionCurve
ToneReproductionCurve - TRCs are used to describe RGB
and Grayscale profiles. The TRC is essentially the gamma
function of the color space.
For example, Apple RGB has a gamma of 1.8, most monitors are ~2.2,
sRGB is 2.4 with a small linear part near 0.
Linear spaces are of course 1.0.
(The exact function is implemented in SrgbConverter)
The ICC specification allows the TRC to be described as a single
Gamma value, where the function is thus out = in**gamma.
Alternatively, the gamma function may be represented by a lookup table
of values, in which case linear interpolation is used.
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
ToneReproductionCurve
public ToneReproductionCurve(float[] trcValues)
Constructs a TRC from a set of float values
ToneReproductionCurve
public ToneReproductionCurve(short[] trcValues)
Constructs a TRC from a set of short values normalized to
the 0-65535 range (as in the ICC profile file).
(Note the values are treated as unsigned)
lookup
public float lookup(float in)
Performs a TRC lookup
reverseLookup
public float reverseLookup(float in)
Performs an reverse lookup
setupReverseTrc
public void setupReverseTrc()
Calculates a reverse-lookup table.
We use a whopping 10,000 entries.. This is should be more than any
real-life TRC table (typically around 256-1024) so we won't be losing
any precision.
This will of course generate completely invalid results if the curve
is not monotonic and invertable. But what's the alternative?
ToneReproductionCurve.java -- Representation of an ICC 'curv' type TRC
Copyright (C) 2004 Free Software Foundation
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