- Qt 6.6
- Qt GUI
- C++ Classes
- QColorTransform
- Qt 6.6.2 Reference Documentation

# QColorTransform Class

The QColorTransform class is a transformation between color spaces. More...

Header: | #include <QColorTransform>
CMake: | find_package(Qt6 REQUIRED COMPONENTS Gui) target_link_libraries(mytarget PRIVATE Qt6::Gui)
qmake: | QT += gui

- List of all members, including inherited members
- QColorTransform is part of Painting Classes.

## Public Functions

bool | isIdentity() const
QRgb | map(QRgb argb) const
QRgba64 | map(QRgba64 rgba64) const
QRgbaFloat16 | map(QRgbaFloat16 rgbafp16) const
QRgbaFloat32 | map(QRgbaFloat32 rgbafp32) const
QColor | map(const QColor &color) const

## Related Non-Members

bool | operator!=(const QColorTransform &ct1, const QColorTransform &ct2)
bool | operator==(const QColorTransform &ct1, const QColorTransform &ct2)

## Detailed Description

QColorTransform is an instantiation of a transformation between color spaces. It can be applied on color and pixels to convert them from one color space to another.

Setting up a QColorTransform takes some preprocessing, so keeping around QColorTransforms that you need often is recommended, instead of generating them on the fly.

## Member Function Documentation

### `[noexcept, since 6.4]` bool QColorTransform::isIdentity() const

Returns true if the color transform is the identity transform.

This function was introduced in Qt 6.4.

### QRgb QColorTransform::map(QRgb argb) const

Applies the color transformation on the QRgb value argb.

The input should be opaque or unpremultiplied.

### QRgba64 QColorTransform::map(QRgba64 rgba64) const

Applies the color transformation on the QRgba64 value rgba64.

The input should be opaque or unpremultiplied.

### `[since 6.4]` QRgbaFloat16 QColorTransform::map(QRgbaFloat16 rgbafp16) const

Applies the color transformation on the QRgbaFloat16 value rgbafp16.

The input should be opaque or unpremultiplied.

This function was introduced in Qt 6.4.

### `[since 6.4]` QRgbaFloat32 QColorTransform::map(QRgbaFloat32 rgbafp32) const

Applies the color transformation on the QRgbaFloat32 value rgbafp32.

The input should be opaque or unpremultiplied.

This function was introduced in Qt 6.4.

### QColor QColorTransform::map(const QColor &color) const

Applies the color transformation on the QColor value color.

## Related Non-Members

### `[since 6.4]` bool operator!=(const QColorTransform &ct1, const QColorTransform &ct2)

Returns true if ct1 does not define the same transformation as ct2.

This function was introduced in Qt 6.4.

### `[since 6.4]` bool operator==(const QColorTransform &ct1, const QColorTransform &ct2)

Returns true if ct1 defines the same color transformation as ct2.

This function was introduced in Qt 6.4.