Package org.apache.pdfbox.pdmodel.graphics.color

Class PDLab

java.lang.Object
org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace
org.apache.pdfbox.pdmodel.graphics.color.PDCIEBasedColorSpace
org.apache.pdfbox.pdmodel.graphics.color.PDCIEDictionaryBasedColorSpace
org.apache.pdfbox.pdmodel.graphics.color.PDLab
All Implemented Interfaces:
COSObjectable
public final class PDLab extends PDCIEDictionaryBasedColorSpace
A Lab colour space is a CIE-based ABC colour space with two transformation stages.

  • Field Details

    • initialColor

      private PDColor initialColor

  • Constructor Details

    • PDLab

      public PDLab()
      Creates a new Lab color space.

    • PDLab

      public PDLab(COSArray lab)
      Creates a new Lab color space from a PDF array.
      Parameters:
      lab - the color space array

  • Method Details

    • getName

      public String getName()
      Description copied from class: PDColorSpace
      Returns the name of the color space.
      Specified by:
      getName in class PDColorSpace
      Returns:
      the name of the color space

    • toRGBImage

      public BufferedImage toRGBImage(WritableRaster raster) throws IOException
      Description copied from class: PDColorSpace
      Returns the (A)RGB equivalent of the given raster.
      Overrides:
      toRGBImage in class PDCIEBasedColorSpace
      Parameters:
      raster - the source raster
      Returns:
      an (A)RGB buffered image
      Throws:
      IOException - if the color conversion fails

    • toRawImage

      public BufferedImage toRawImage(WritableRaster raster)
      Description copied from class: PDColorSpace
      Returns the image in this colorspace or null. No conversion is performed. For special colorspaces like PDSeparation the image is returned in the gray colorspace. For undefined colorspaces like DeviceCMYK/DeviceRGB and DeviceGray null is returned. You can always fallback to PDColorSpace.toRGBImage(WritableRaster) if this returns null.
      Overrides:
      toRawImage in class PDCIEBasedColorSpace
      Parameters:
      raster - the source raster
      Returns:
      an buffered image in this colorspace. Or null if it is not possible to extract that image with the original colorspace without conversion.

    • toRGB

      public float[] toRGB(float[] value)
      Description copied from class: PDColorSpace
      Returns the RGB equivalent of the given color value.
      Specified by:
      toRGB in class PDColorSpace
      Parameters:
      value - a color value with component values between 0 and 1
      Returns:
      an array of R,G,B value between 0 and 255

    • inverse

      private float inverse(float x)

    • getNumberOfComponents

      public int getNumberOfComponents()
      Description copied from class: PDColorSpace
      Returns the number of components in this color space
      Specified by:
      getNumberOfComponents in class PDColorSpace
      Returns:
      the number of components in this color space

    • getDefaultDecode

      public float[] getDefaultDecode(int bitsPerComponent)
      Description copied from class: PDColorSpace
      Returns the default decode array for this color space.
      Specified by:
      getDefaultDecode in class PDColorSpace
      Parameters:
      bitsPerComponent - the number of bits per component.
      Returns:
      the default decode array

    • getInitialColor

      public PDColor getInitialColor()
      Description copied from class: PDColorSpace
      Returns the initial color value for this color space.
      Specified by:
      getInitialColor in class PDColorSpace
      Returns:
      the initial color value for this color space

    • getDefaultRangeArray

      private COSArray getDefaultRangeArray()
      creates a range array with default values (-100..100 -100..100).
      Returns:
      the new range array.

    • getARange

      public PDRange getARange()
      This will get the valid range for the "a" component. If none is found then the default will be returned, which is -100..100.
      Returns:
      the "a" range.

    • getBRange

      public PDRange getBRange()
      This will get the valid range for the "b" component. If none is found then the default will be returned, which is -100..100.
      Returns:
      the "b" range.

    • setARange

      public void setARange(PDRange range)
      This will set the a range for the "a" component.
      Parameters:
      range - the new range for the "a" component, or null if defaults (-100..100) are to be set.

    • setBRange

      public void setBRange(PDRange range)
      This will set the "b" range for this color space.
      Parameters:
      range - the new range for the "b" component, or null if defaults (-100..100) are to be set.

    • setComponentRangeArray

      private void setComponentRangeArray(PDRange range, int index)