LabColorSpace Class

class LabColorSpace : ColorSpace

Namespace:Datalogics::PDFL

Inherits from:: ColorSpace

Detailed Description

A Lab color space is a CIE-based ABC color space with two transformation stages.

In this type of space, A, B, and C represent the L*, a*, and b* components of a CIE 1976 L*a*b* space. The range of the first (L*) component is always 0 to 100; the ranges of the second and third (a* and b*) components are defined by the Range.

Uses types

ColorSpace PDFObject

Constructor & Destructor Documentation

LabColorSpace(System.Collections.Generic.IList< System.Double > whitePoint)

Parameters

whitePoint: System.Collections.Generic.IList< System.Double >: An array of three numbers specifying the tristimulus value, in the CIE 1931 XYZ space, of the diffuse white point. The numbers X and Z must be positive, and Y must be equal to 1.0.

Create a Lab color space.

The blackPoint defaults to [0.0, 0.0, 0.0].

The range defaults to [-100 100 -100 100]

LabColorSpace(System.Collections.Generic.IList< System.Double > whitePoint, System.Collections.Generic.IList< System.Double > blackPoint, System.Collections.Generic.IList< System.Double > range)

Parameters

whitePoint: System.Collections.Generic.IList< System.Double >: An array of three numbers specifying the tristimulus value, in the CIE 1931 XYZ space, of the diffuse white point. The numbers X and Z must be positive, and Y must be equal to 1.0.
blackPoint: System.Collections.Generic.IList< System.Double >: An array of three numbers specifying the tristimulus value, in the CIE 1931 XYZ space, of the diffuse black point. All three of these numbers must be non-negative.
range: System.Collections.Generic.IList< System.Double >: An array of four numbers [ amin amax bmin bmax ] specifying the range of valid values for the a* and b* (B and C) components of the color space.

Create a Lab color space.

Property Documentation

System.Collections.Generic.IList< System.Double > BlackPoint[get]

The black point tristimulus value for this Lab color space.

An array of three numbers specifying the tristimulus value, in the CIE 1931 XYZ space, of the diffuse black point. All three of these numbers must be non-negative. If no black point was specified during construction, the default value [0.0, 0.0, 0.0] is returned.

static ColorSpace DeviceCMYK[get]

The DeviceCMYK color space, representing cyan, magenta, yellow, and black components.

static ColorSpace DeviceGray[get]

The DeviceGray color space, representing a single grayscale component.

static ColorSpace DeviceRGB[get]

The DeviceRGB color space, representing red, green, and blue components.

static ColorSpace DeviceRGBA[get]

The DeviceRGBA color space, representing red, green, blue, and alpha components.

static ColorSpace Lab[get]

The CIE-based L*a*b* color space.

static ColorSpace LabA[get]

The CIE-based L*a*b* color space with an alpha component.

string Name[get]

The name of the color space. A named color space may be named something like DeviceRGB. More complicated color spaces may have a name like Indexed or ICCBased.

int NumComponents[get]

The number of components in the color space.

For example, DeviceGray has 1 component, DeviceRGB has 3, and DeviceCMYK has 4.

PDFObject PDFObject[get]

Get the PDFObject associated with the color space. This may be a PDFName, PDFDict, PDFStream, or PDFArray.

System.Collections.Generic.IList< System.Double > Range[get]

The range of valid values for the a* and b* components.

An array of four numbers [ amin amax bmin bmax ] specifying the range of valid values for the a* and b* (B and C) components of the color space. If no range was specified during construction, the default value [-100, 100, -100, 100] is returned.

System.Collections.Generic.IList< System.Double > WhitePoint[get]

The white point tristimulus value for this Lab color space.

An array of three numbers specifying the tristimulus value, in the CIE 1931 XYZ space, of the diffuse white point. The numbers X and Z must be positive, and Y must be equal to 1.0.

Member Function Documentation

void Dispose()

Returns:

void

override bool Equals(object obj)

Parameters

obj: object

Returns:

override bool

override string ToString()

Returns:

override string

A string describing this ColorSpace.

Convert a ColorSpace to a string representation.

static bool operator!=(ColorSpace a, ColorSpace b)

Parameters

a: ColorSpace: The first ColorSpace to compare.
b: ColorSpace: The second ColorSpace to compare.

Returns:

bool

true if the two ColorSpace objects are not equal; false otherwise.

Test two ColorSpace objects for inequality.

static bool operator==(ColorSpace a, ColorSpace b)

Parameters

a: ColorSpace: The first ColorSpace to compare.
b: ColorSpace: The second ColorSpace to compare.

Returns:

bool

true if the two ColorSpace objects are equal; false otherwise.

Test two ColorSpace objects for equality.