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## org.faceless.pdf2
Class CMYKColorSpace

    java.lang.Object
      java.awt.color.ColorSpace
          org.faceless.pdf2.CMYKColorSpace

All Implemented Interfaces:
  Serializable

    public final class CMYKColorSpace

extends ColorSpace

A subclass of `ColorSpace` representing the uncalibrated (device-dependent) CMYK color space available in PDF documents.

If colors need to be specified in CMYK, but device-independent color (the kind available with an ICC Profile) is not required, this ColorSpace should be used, as it doesn't require an ICC profile to be embedded in the PDF (resulting in a much smaller file). For some subsets of PDF (specifically `PDF/X`), RGB colors are not allowed, so anyone creating documents for that profile will probably make heavy use of this colorspace.

Typically this class will be used as follows:

     Color cyan = CMYKColorSpace.getColor(1,0,0,0);

## Conversion to RGB

When rendering PDFs containing CMYK images or graphics to RGB, the characteristics of this space become important. Since version 2.11.8 the device-dependent space defaults to a fast generic CMYK profile, however this can be changed by setting the System property `org.faceless.pdf2.DeviceCMYK` to one of the following options:

generic | A generic CMYK profile
swop | A fast approximation of US Web Coated (SWOP) v2
fogra | A fast approximation of Coated FOGRA39 from ISO12647-2:2004
photo | A high-contrast CMYK profile of the type used to print photos
adobe | Conversion to RGB is done using the algorithm from the PDF specification. This generally gives oversaturated, poor results.
ghostscript | Conversion to RGB is done using the algorithm used by GhostScript. This gives results only slightly better than the Adobe algorithm.

So for example, to convert the Altona Visual Test Suite PDF to RGB using US Web Coated SWOP as the default CMYK Color profile, you could run our `PDFToImage` example as follows:

     java -Dorg.faceless.pdf2.DeviceCMYK=swop --model rgb PDFToImage altona_visual_1v2a_x3.pdf

Since:
  1.1.5

Field Summary
`static Color` | `BLACK` A convenient constant that represents the color black in the uncalibrated CMYK colorspace
`static ColorSpace` | `GRAYSPACE`
`static Color` | `WHITE` A convenient constant that represents the color white in the uncalibrated CMYK colorspace

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`

Method Summary
`float[]` | `fromCIEXYZ(float[] xyz)`
`float[]` | `fromRGB(float[] rgb)`
`static Color` | `getColor(float c, float m, float y, float k)` A convenience method, returning an opaque color in the CMYK colorspace with the specified levels of cyan, magenta, yellow and black.
`static Color` | `getColor(float c, float m, float y, float k, float a)` A convenience method, returning a color in the CMYK colorspace with the specified levels of cyan, magenta, yellow and black, and the specified alpha value.
`static double` | `getDeltaE(ColorSpace c1, ColorSpace c2)` Return a number representing the difference between 2 ColorSpaces.
`static CMYKColorSpace` | `getInstance()` Return a CMYK Color Space
`static CMYKColorSpace` | `getInstance(String type)`
`float[]` | `toCIEXYZ(float[] cmyk)`
`float[]` | `toRGB(float[] cmyk)`
`int[]` | `toRGB(int[] cmyk, int[] rgb)`

Methods inherited from class java.awt.color.ColorSpace
`getInstance, getMaxValue, getMinValue, getName, getNumComponents, getType, isCS_sRGB`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### BLACK

    public static final Color BLACK

  A convenient constant that represents the color black in the uncalibrated CMYK colorspace

### WHITE

    public static final Color WHITE

  A convenient constant that represents the color white in the uncalibrated CMYK colorspace

### GRAYSPACE

    public static final ColorSpace GRAYSPACE

Method Detail

### getInstance

    public static CMYKColorSpace getInstance(String type)

### getInstance

    public static CMYKColorSpace getInstance()

  Return a CMYK Color Space

### toRGB

    public float[] toRGB(float[] cmyk)

  Specified by:
    `toRGB` in class `ColorSpace`

### toRGB

    public int[] toRGB(int[] cmyk,
                       int[] rgb)

### fromRGB

    public float[] fromRGB(float[] rgb)

  Specified by:
    `fromRGB` in class `ColorSpace`

### fromCIEXYZ

    public float[] fromCIEXYZ(float[] xyz)

  Specified by:
    `fromCIEXYZ` in class `ColorSpace`

### toCIEXYZ

    public float[] toCIEXYZ(float[] cmyk)

  Specified by:
    `toCIEXYZ` in class `ColorSpace`

### getColor

    public static Color getColor(float c,
                                 float m,
                                 float y,
                                 float k)

  A convenience method, returning an opaque color in the CMYK colorspace with the specified levels of cyan, magenta, yellow and black. The parameters must be in the range from 0.0 to 1.0, or an `IllegalArgumentException` is thrown

  Parameters:
    `c` - the level of cyan from 0.0 to 1.0
    `m` - the level of magenta from 0.0 to 1.0
    `y` - the level of yellow from 0.0 to 1.0
    `k` - the level of black from 0.0 to 1.0
  Throws:
    `IllegalArgumentException` - if any of the parameters are outside the renage `0 <= n <= 1`

### getColor

    public static Color getColor(float c,
                                 float m,
                                 float y,
                                 float k,
                                 float a)

  A convenience method, returning a color in the CMYK colorspace with the specified levels of cyan, magenta, yellow and black, and the specified alpha value. All the parameters must be in the range from 0.0 to 1.0, or an `IllegalArgumentException` is thrown

  Parameters:
    `c` - the level of cyan from 0.0 to 1.0
    `m` - the level of magenta from 0.0 to 1.0
    `y` - the level of yellow from 0.0 to 1.0
    `k` - the level of black from 0.0 to 1.0
    `a` - the alpha level to use - 0 is transparent, 1 is opaque.
  Throws:
    `IllegalArgumentException` - if any of the parameters are outside the renage `0 <= n <= 1`

### getDeltaE

    public static double getDeltaE(ColorSpace c1,
                                   ColorSpace c2)

  Return a number representing the difference between 2 ColorSpaces. Used internally by the PDF library

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