mmcv.image.adjust_brightness

mmcv.image.adjust_brightness(img, factor=1.0, backend=None)

Adjust image brightness.

This function controls the brightness of an image. An enhancement factor of 0.0 gives a black image. A factor of 1.0 gives the original image. This function blends the source image and the degenerated black image:

\[output = img * factor + degenerated * (1 - factor)\]

Parameters

• img (ndarray) – Image to be brightened.

• factor (float) – A value controls the enhancement. Factor 1.0 returns the original image, lower factors mean less color (brightness, contrast, etc), and higher values more. Default 1.

• backend (str | None) – The image processing backend type. Options are cv2, pillow, None. If backend is None, the global imread_backend specified by mmcv.use_backend() will be used. Defaults to None.

Returns

The brightened image.

Return type

ndarray