QColorSpace ¶

概要 ¶

详细描述 ¶

Color values can be interpreted in different ways, and based on the interpretation can live in different spaces. We call this color spaces .

QColorSpace provides access to creating several predefined color spaces and can generate QColorTransforms for converting colors from one color space to another.

QColorSpace can also represent color spaces defined by ICC profiles or embedded in images, that do not otherwise fit the predefined color spaces.

A color space can generally speaking be conceived as a combination of set of primary colors and a transfer function. The primaries defines the axes of the color space, and the transfer function how values are mapped on the axes. The primaries are defined by three primary colors that represent exactly how red, green, and blue look in this particular color space, and a white color that represents where and how bright pure white is. The range of colors expressable by the primary colors is called the gamut, and a color space that can represent a wider range of colors is also known as a wide-gamut color space.

The transfer function or gamma curve determines how each component in the color space is encoded. These are used because human perception does not operate linearly, and the transfer functions try to ensure that colors will seem evenly spaced to human eyes.

class QColorSpace ¶

QColorSpace(namedColorSpace)

QColorSpace(primaries, fun[, gamma=0.0f])

QColorSpace(primaries, gamma)

QColorSpace(colorSpace)

QColorSpace(whitePoint, redPoint, greenPoint, bluePoint, fun[, gamma=0.0f])

param greenPoint

QPointF

param primaries

Primaries

param redPoint

QPointF

param fun

TransferFunction

param colorSpace

QColorSpace

param namedColorSpace

NamedColorSpace

param gamma

float

param bluePoint

QPointF

param whitePoint

QPointF

Creates a new colorspace object that represents an undefined and invalid colorspace.

Creates a new colorspace object that represents a namedColorSpace .

Creates a custom color space with the primaries primaries , using the transfer function fun and optionally gamma .

Creates a custom color space with the primaries primaries , using a gamma transfer function of gamma .

Creates a custom colorspace with a primaries based on the chromaticities of the primary colors whitePoint , redPoint , greenPoint and bluePoint , and using the transfer function fun and optionally gamma .

PySide2.QtGui.QColorSpace. NamedColorSpace ¶

Predefined color spaces.

常量	描述
QColorSpace.SRgb	The sRGB color space, which Qt operates in by default. It is a close approximation of how most classic monitors operate, and a mode most software and hardware support. ICC registration of sRGB .
QColorSpace.SRgbLinear	The sRGB color space with linear gamma. Useful for gamma-corrected blending.
QColorSpace.AdobeRgb	The Adobe RGB color space is a classic wide-gamut color space, using a gamma of 2.2. ICC registration of Adobe RGB (1998)
QColorSpace.DisplayP3	A color-space using the primaries of DCI-P3, but with the whitepoint and transfer function of sRGB. Common in modern wide-gamut screens. ICC registration of DCI-P3
QColorSpace.ProPhotoRgb	The Pro Photo RGB color space, also known as ROMM RGB is a very wide gamut color space. ICC registration of ROMM RGB

PySide2.QtGui.QColorSpace. Primaries ¶

Predefined sets of primary colors.

常量	描述
QColorSpace.Primaries.Custom	The primaries are undefined or does not match any predefined sets.
QColorSpace.Primaries.SRgb	The sRGB primaries
QColorSpace.Primaries.AdobeRgb	The Adobe RGB primaries
QColorSpace.Primaries.DciP3D65	The DCI-P3 primaries with the D65 whitepoint
QColorSpace.Primaries.ProPhotoRgb	The ProPhoto RGB primaries with the D50 whitepoint

PySide2.QtGui.QColorSpace. TransferFunction ¶

Predefined transfer functions or gamma curves.

常量	描述
QColorSpace.TransferFunction.Custom	The custom or null transfer function
QColorSpace.TransferFunction.Linear	The linear transfer functions
QColorSpace.TransferFunction.Gamma	A transfer function that is a real gamma curve based on the value of gamma()
QColorSpace.TransferFunction.SRgb	The sRGB transfer function, composed of linear and gamma parts
QColorSpace.TransferFunction.ProPhotoRgb	The ProPhoto RGB transfer function, composed of linear and gamma parts

static PySide2.QtGui.QColorSpace. fromIccProfile ( iccProfile ) ¶

参数

iccProfile – QByteArray

返回类型

QColorSpace

创建 QColorSpace from ICC profile iccProfile .

注意

Not all ICC profiles are supported. QColorSpace only supports RGB-XYZ ICC profiles that are three-component matrix-based.

If the ICC profile is not supported an invalid QColorSpace is returned where you can still read the original ICC profile using iccProfile() .

另请参阅

iccProfile()

PySide2.QtGui.QColorSpace. gamma ( ) ¶

返回类型

float

Returns the gamma value of color spaces with TransferFunction::Gamma , an approximate gamma value for other predefined color spaces, or 0.0 if no approximate gamma is known.

另请参阅

transferFunction()

PySide2.QtGui.QColorSpace. iccProfile ( ) ¶

返回类型

QByteArray

Returns an ICC profile representing the color space.

If the color space was generated from an ICC profile, that profile is returned, otherwise one is generated.

注意

Even invalid color spaces may return the ICC profile if they were generated from one, to allow applications to implement wider support themselves.

另请参阅

fromIccProfile()

PySide2.QtGui.QColorSpace. isValid ( ) ¶

返回类型

bool

返回 true if the color space is valid.

PySide2.QtGui.QColorSpace. __ne__ ( colorSpace2 ) ¶

参数

colorSpace2 – QColorSpace

返回类型

bool

PySide2.QtGui.QColorSpace. __eq__ ( colorSpace2 ) ¶

参数

colorSpace2 – QColorSpace

返回类型

bool

PySide2.QtGui.QColorSpace. primaries ( ) ¶

返回类型

Primaries

Returns the predefined primaries of the color space or primaries::Custom if it doesn’t match any of them.

另请参阅

setPrimaries()

PySide2.QtGui.QColorSpace. setPrimaries ( primariesId ) ¶

参数

primariesId – Primaries

Sets the primaries to those of the primariesId set.

另请参阅

primaries()

PySide2.QtGui.QColorSpace. setPrimaries ( whitePoint , redPoint , greenPoint , bluePoint ) ¶

参数

• whitePoint – QPointF

• redPoint – QPointF

• greenPoint – QPointF

• bluePoint – QPointF

Set primaries to the chromaticities of whitePoint , redPoint , greenPoint and bluePoint .

另请参阅

primaries()

PySide2.QtGui.QColorSpace. setTransferFunction ( transferFunction [ , gamma=0.0f ] ) ¶

参数

• transferFunction – TransferFunction

• gamma – float

Sets the transfer function to transferFunction and gamma .

另请参阅

transferFunction() gamma() withTransferFunction()

PySide2.QtGui.QColorSpace. swap ( colorSpace ) ¶

参数

colorSpace – QColorSpace

Swaps color space other with this color space. This operation is very fast and never fails.

PySide2.QtGui.QColorSpace. transferFunction ( ) ¶

返回类型

TransferFunction

Returns the predefined transfer function of the color space or TransferFunction::Custom if it doesn’t match any of them.

另请参阅

gamma() setTransferFunction() withTransferFunction()

PySide2.QtGui.QColorSpace. withTransferFunction ( transferFunction [ , gamma=0.0f ] ) ¶

参数

• transferFunction – TransferFunction

• gamma – float

返回类型

QColorSpace

Returns a copy of this color space, except using the transfer function transferFunction and gamma .

另请参阅

transferFunction() gamma() setTransferFunction()