ToneReproductionCurve

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gnu.java.awt.color
Class ToneReproductionCurve

java.lang.Object
  gnu.java.awt.color.ToneReproductionCurve

public class ToneReproductionCurve
extends java.lang.Object

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.

Field Summary

private float gamma


private float[] reverseTrc


private float[] trc


Constructor Summary

ToneReproductionCurve(float gamma)
          Constructs a TRC from a gamma values

ToneReproductionCurve(float[] trcValues)
          Constructs a TRC from a set of float values

ToneReproductionCurve(short[] trcValues)
          Constructs a TRC from a set of short values normalized to the 0-65535 range (as in the ICC profile file).

Method Summary

float lookup(float in)
          Performs a TRC lookup

float reverseLookup(float in)
          Performs an reverse lookup

void setupReverseTrc()
          Calculates a reverse-lookup table.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

trc

private float[] trc

gamma

private float gamma

reverseTrc

private float[] reverseTrc

Constructor Detail