org.sunflow.image
Class ColorEncoder

java.lang.Object
  org.sunflow.image.ColorEncoder

public final class ColorEncoder
extends java.lang.Object

This class contains many static helper methods that may be helpful for encoding colors into files.

Constructor Summary

ColorEncoder()

Method Summary

static int[]	encodeRGBE(Color[] color) Encode the specified colors using Ward's RGBE technique.
static byte[]	quantizeRGB8(Color[] color) Quantize the specified colors to 8-bit RGB format.
static byte[]	quantizeRGBA8(Color[] color, float[] alpha) Quantize the specified colors to 8-bit RGBA format.
static Color[]	unlinearize(Color[] color) Moves the colors in the specified array to non-linear space.
static Color[]	unpremult(Color[] color, float[] alpha) Undoes the premultiplication of the specified color array.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColorEncoder

public ColorEncoder()

Method Detail

unpremult

public static final Color[] unpremult(Color[] color,
                                      float[] alpha)

Undoes the premultiplication of the specified color array. The original colors are not modified.

Parameters:

color - an array of premultiplied colors

alpha - alpha values corresponding to the colors

Returns:

an array of unpremultiplied colors

unlinearize

public static final Color[] unlinearize(Color[] color)

Moves the colors in the specified array to non-linear space. The original colors are not modified.

Parameters:

color - an array of colors in linear space

Returns:

a new array of the same colors in non-linear space

quantizeRGB8

public static final byte[] quantizeRGB8(Color[] color)

Quantize the specified colors to 8-bit RGB format. The returned array contains 3 bytes for each color in the original array.

Parameters:

color - array of colors to quantize

Returns:

array of quantized RGB values

quantizeRGBA8

public static final byte[] quantizeRGBA8(Color[] color,
                                         float[] alpha)

Quantize the specified colors to 8-bit RGBA format. The returned array contains 4 bytes for each color in the original array.

Parameters:

color - array of colors to quantize

alpha - array of alpha values (same length as color)

Returns:

array of quantized RGBA values

encodeRGBE

public static final int[] encodeRGBE(Color[] color)

Encode the specified colors using Ward's RGBE technique. The returned array contains one int for each color in the original array.

Parameters:

color - array of colors to encode

Returns:

array of encoded colors