mmcv.image.adjust_contrast

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

Adjust image contrast.

This function controls the contrast of an image. An enhancement factor of 0.0 gives a solid grey image. A factor of 1.0 gives the original image. It blends the source image and the degenerated mean image:

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

Parameters

• img (ndarray) – Image to be contrasted. BGR order.

• factor (float) – Same as mmcv.adjust_brightness().

• 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 contrasted image.

Return type

ndarray