The QImageReader class provides a format independent interface for reading images from files or other devices.| doc.qt.io
The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.| doc.qt.io
The QIcon class provides scalable icons in different modes and states.| doc.qt.io
The QPixmap class is an off-screen image representation that can be used as a paint device.| doc.qt.io