QColorSpace#

The QColorSpace class provides a color space abstraction. More…

Synopsis#

Functions#

def description ()
def gamma ()
def iccProfile ()
def isValid ()
def __ne__ (colorSpace2)
def __eq__ (colorSpace2)
def primaries ()
def setDescription (description)
def setPrimaries (whitePoint, redPoint, greenPoint, bluePoint)
def setPrimaries (primariesId)
def setTransferFunction (transferFunction[, gamma=0.0f])
def setTransferFunction (transferFunctionTable)
def setTransferFunctions (redTransferFunctionTable, greenTransferFunctionTable, blueTransferFunctionTable)
def swap (colorSpace)
def transferFunction ()
def transformationToColorSpace (colorspace)
def withTransferFunction (transferFunction[, gamma=0.0f])
def withTransferFunction (transferFunctionTable)
def withTransferFunctions (redTransferFunctionTable, greenTransferFunctionTable, blueTransferFunctionTable)

Static functions#

def fromIccProfile (iccProfile)

Note

This documentation may contain snippets that were automatically translated from C++ to Python. We always welcome contributions to the snippet translation. If you see an issue with the translation, you can also let us know by creating a ticket on https:/bugreports.qt.io/projects/PYSIDE

Detailed Description#

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 expressible 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 PySide6.QtGui.QColorSpace#

PySide6.QtGui.QColorSpace(namedColorSpace)

PySide6.QtGui.QColorSpace(primaries, transferFunction[, gamma=0.0f])

PySide6.QtGui.QColorSpace(primaries, transferFunctionTable)

PySide6.QtGui.QColorSpace(primaries, gamma)

PySide6.QtGui.QColorSpace(colorSpace)

PySide6.QtGui.QColorSpace(whitePoint, redPoint, greenPoint, bluePoint, transferFunction[, gamma=0.0f])

PySide6.QtGui.QColorSpace(whitePoint, redPoint, greenPoint, bluePoint, redTransferFunctionTable, greenTransferFunctionTable, blueTransferFunctionTable)

PySide6.QtGui.QColorSpace(whitePoint, redPoint, greenPoint, bluePoint, transferFunctionTable)

Parameters:

whitePoint – PySide6.QtCore.QPointF
colorSpace – PySide6.QtGui.QColorSpace
blueTransferFunctionTable –
namedColorSpace – NamedColorSpace
transferFunctionTable –
transferFunction – TransferFunction
greenPoint – PySide6.QtCore.QPointF
redPoint – PySide6.QtCore.QPointF
greenTransferFunctionTable –
gamma – float
bluePoint – PySide6.QtCore.QPointF
redTransferFunctionTable –
primaries – Primaries

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 transferFunction and optionally gamma.

Creates a custom color space with the primaries gamut, using a custom transfer function described by transferFunctionTable.

The table should contain at least 2 values, and contain an monotonically increasing list of values from 0 to 65535.

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

Creates a new colorspace object that represents a namedColorSpace.

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 transferFunction and optionally gamma.

Creates a custom color space with primaries based on the chromaticities of the primary colors whitePoint, redPoint, greenPoint and bluePoint, and using the custom transfer functions described by redTransferFunctionTable, greenTransferFunctionTable, and blueTransferFunctionTable.

PySide6.QtGui.QColorSpace.NamedColorSpace#

Predefined color spaces.

Constant

Description

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

Constant	Description
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

PySide6.QtGui.QColorSpace.Primaries#

Predefined sets of primary colors.

Constant

Description

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

Constant	Description
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

PySide6.QtGui.QColorSpace.TransferFunction#

Predefined transfer functions or gamma curves.

Constant

Description

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

Constant	Description
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

PySide6.QtGui.QColorSpace.description()#

Return type:: str

Returns the name or short description. If a description hasn’t been given in setDescription() , the original name of the profile is returned if the profile is unmodified, a guessed name is returned if the profile has been recognized as a known color space, otherwise an empty string is returned.

See also

setDescription()

static PySide6.QtGui.QColorSpace.fromIccProfile(iccProfile)#

Parameters:: iccProfile – PySide6.QtCore.QByteArray
Return type:: PySide6.QtGui.QColorSpace

Creates a QColorSpace from ICC profile iccProfile.

Note

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() .

See also

iccProfile()

PySide6.QtGui.QColorSpace.gamma()#

Return type:: 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.

See also

transferFunction()

PySide6.QtGui.QColorSpace.iccProfile()#

Return type:: PySide6.QtCore.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.

Note

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