net.sf.jcgm.core
Class CMYKColorSpace

java.lang.Object
  java.awt.color.ColorSpace
      net.sf.jcgm.core.CMYKColorSpace

All Implemented Interfaces:

java.io.Serializable

public class CMYKColorSpace
extends java.awt.color.ColorSpace
implements java.io.Serializable

A simple CMYK color space. ICC provides a CMYK.pf file you can load into the ICC ColorSpace. This is a convenience class to avoid doing that.

Version:

$Id: CMYKColorSpace.java 46 2011-12-14 08:26:44Z phica $

See Also:

java.awt.color.ColorSpace, java.awt.color.ICC_ColorSpace, Serialized Form

Field Summary

Fields inherited from class java.awt.color.ColorSpace

CS_CIEXYZ, CS_GRAY, CS_LINEAR_RGB, CS_PYCC, CS_sRGB, TYPE_2CLR, TYPE_3CLR, TYPE_4CLR, TYPE_5CLR, TYPE_6CLR, TYPE_7CLR, TYPE_8CLR, TYPE_9CLR, TYPE_ACLR, TYPE_BCLR, TYPE_CCLR, TYPE_CMY, TYPE_CMYK, TYPE_DCLR, TYPE_ECLR, TYPE_FCLR, TYPE_GRAY, TYPE_HLS, TYPE_HSV, TYPE_Lab, TYPE_Luv, TYPE_RGB, TYPE_XYZ, TYPE_YCbCr, TYPE_Yxy

Constructor Summary

CMYKColorSpace()
Create a new CMYKColorSpace Instance.

Method Summary

float[]	fromCIEXYZ(float[] p_colorvalue) Converts to CMYK from CIEXYZ.
float[]	fromRGB(float[] p_rgbvalue) Converts a given RGB to CMYK.
static float[]	normalize(float[] p_colors) Normalize ensures all color values returned are between 0 and 1.
float[]	toCIEXYZ(float[] p_colorvalue) Converts the CMYK color to CIEXYZ.
float[]	toRGB(float[] p_colorvalue) Converts CMYK colors to RGB.

Methods inherited from class java.awt.color.ColorSpace

getInstance, getMaxValue, getMinValue, getName, getNumComponents, getType, isCS_sRGB

Methods inherited from class java.lang.Object

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

Constructor Detail

CMYKColorSpace

public CMYKColorSpace()

Create a new CMYKColorSpace Instance.

Method Detail

fromCIEXYZ

public float[] fromCIEXYZ(float[] p_colorvalue)

Converts to CMYK from CIEXYZ. We cheat here, using the RGB colorspace to do the math for us. The toCIEXYZ function has a description of how this is supposed to work, which may be implemented in the future.

Specified by:

fromCIEXYZ in class java.awt.color.ColorSpace

See Also:

ColorSpace.fromCIEXYZ(float[]), org.scantegrity.lib.CMYKColorSpace#toCIEXYZ

fromRGB

public float[] fromRGB(float[] p_rgbvalue)

Converts a given RGB to CMYK. RGB doesn't really use black, so K will always be 0. On printers, the black should actually look dark brown. RGB (an additive space) is simply the backwards from CMY (a subtractive space), so all we do is: C = 1-R M = 1-G Y = 1-B

Specified by:

fromRGB in class java.awt.color.ColorSpace

Parameters:

p_rgbvalue - - The color to translate

Returns:

a float[4] of the CMYK values.

See Also:

ColorSpace.fromRGB(float[])

toCIEXYZ

public float[] toCIEXYZ(float[] p_colorvalue)

Converts the CMYK color to CIEXYZ. Because CIEXYZ is 3-component, we cheat, converting to RGB and then using the RGB colorspace function to do the conversion. Details on this colorspace are available on wikipedia: http://en.wikipedia.org/wiki/CIE_XYZ_color_space There is also an "ideal relationship" to CMYK, which might be implemented in the future (don't recall the reference we got this from, probably color.org): C = (C' - K)/(1 - K) M = (M' - K)/(1 - K) Y = (Y' - K)/(1 - K) K = Min(C', M', Y') X 41.2453 35.7580 18.0423 | 1-C' Y = 21.2671 71.5160 07.2169 | 1-M' Z 01.9334 11.9193 95.0227 | 1-Y'

Specified by:

toCIEXYZ in class java.awt.color.ColorSpace

See Also:

ColorSpace.toCIEXYZ(float[])

toRGB

public float[] toRGB(float[] p_colorvalue)

Converts CMYK colors to RGB. Note that converting back will be lossy. The formula for this is: K = 1 - K (go to additive) R = K * (1 - C) G = K * (1 - M) B = K * (1 - Y)

Specified by:

toRGB in class java.awt.color.ColorSpace

Parameters:

p_colorvalue - The color in CMYK.

See Also:

ColorSpace.toRGB(float[])

normalize

public static float[] normalize(float[] p_colors)

Normalize ensures all color values returned are between 0 and 1.

Parameters:

p_colors -

Returns:

p_colors, with any values greater than 1 set to 1, and less than 0 set to 0.