/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.sanselan.formats.tiff.photometricinterpreters;
import java.io.IOException;
import org.apache.sanselan.ImageReadException;
import com.google.code.appengine.awt.image.BufferedImage;
public class PhotometricInterpreterLogLUV extends PhotometricInterpreter
{
// private final boolean yOnly;
public PhotometricInterpreterLogLUV(int fSamplesPerPixel,
int fBitsPerSample[], int Predictor, int width, int height,
boolean yonly)
{
super(fSamplesPerPixel, fBitsPerSample, Predictor, width, height);
// this.yOnly = yonly;
}
public void dumpstats() throws ImageReadException, IOException
{
}
private float cube(float f)
{
return f * f * f;
}
// private float function_f(float value, )
public void interpretPixel(BufferedImage bi, int samples[], int x, int y)
throws ImageReadException, IOException
{
float X, Y, Z;
int cieL = samples[0];
int cieA = (byte) samples[1];
int cieB = (byte) samples[2];
{
float var_Y = ((cieL * 100.0f / 255.0f) + 16.0f) / 116.0f;
float var_X = cieA / 500.0f + var_Y;
float var_Z = var_Y - cieB / 200.0f;
float var_x_cube = cube(var_X);
float var_y_cube = cube(var_Y);
float var_z_cube = cube(var_Z);
if (var_y_cube > 0.008856f)
var_Y = var_y_cube;
else
var_Y = (var_Y - 16 / 116.0f) / 7.787f;
if (var_x_cube > 0.008856f)
var_X = var_x_cube;
else
var_X = (var_X - 16 / 116.0f) / 7.787f;
if (var_z_cube > 0.008856f)
var_Z = var_z_cube;
else
var_Z = (var_Z - 16 / 116.0f) / 7.787f;
float ref_X = 95.047f;
float ref_Y = 100.000f;
float ref_Z = 108.883f;
X = ref_X * var_X; //ref_X = 95.047 Observer= 2, Illuminant= D65
Y = ref_Y * var_Y; //ref_Y = 100.000
Z = ref_Z * var_Z; //ref_Z = 108.883
}
// ref_X = 95.047 //Observer = 2, Illuminant = D65
// ref_Y = 100.000
// ref_Z = 108.883
int R, G, B;
{
float var_X = X / 100f; //X = From 0 to ref_X
float var_Y = Y / 100f; //Y = From 0 to ref_Y
float var_Z = Z / 100f; //Z = From 0 to ref_Y
float var_R = var_X * 3.2406f + var_Y * -1.5372f + var_Z * -0.4986f;
float var_G = var_X * -0.9689f + var_Y * 1.8758f + var_Z * 0.0415f;
float var_B = var_X * 0.0557f + var_Y * -0.2040f + var_Z * 1.0570f;
if (var_R > 0.0031308)
var_R = 1.055f * (float) Math.pow(var_R, (1 / 2.4)) - 0.055f;
else
var_R = 12.92f * var_R;
if (var_G > 0.0031308)
var_G = 1.055f * (float) Math.pow(var_G, (1 / 2.4)) - 0.055f;
else
var_G = 12.92f * var_G;
if (var_B > 0.0031308)
var_B = 1.055f * (float) Math.pow(var_B, (1 / 2.4)) - 0.055f;
else
var_B = 12.92f * var_B;
// var_R = (((var_R-)))
// updateMaxMin(new float[]{
// var_R, var_G, var_B,
// }, maxVarRGB, minVarRGB);
// var_R = ((var_R + 0.16561039f) / (3.0152583f + 0.16561039f));
// var_G = ((var_G + 0.06561642f) / (3.0239854f + 0.06561642f));
// var_B = ((var_B + 0.19393992f) / (3.1043448f + 0.19393992f));
R = (int) (var_R * 255f);
G = (int) (var_G * 255f);
B = (int) (var_B * 255f);
}
// float R = 1.910f * X - 0.532f * Y - 0.288f * Z;
// float G = -0.985f * X + 1.999f * Y - 0.028f * Z;
// float B = 0.058f * X - 0.118f * Y + 0.898f * Z;
// updateMaxMin(new float[]{
// R, G, B,
// }, maxRGB, minRGB);
int red = R;
int green = G;
int blue = B;
red = Math.min(255, Math.max(0, red));
green = Math.min(255, Math.max(0, green));
blue = Math.min(255, Math.max(0, blue));
int alpha = 0xff;
int rgb = (alpha << 24) | (red << 16) | (green << 8) | (blue << 0);
bi.setRGB(x, y, rgb);
}
}