nvidia.dali.fn.color_twist¶
-
nvidia.dali.fn.
color_twist
(*inputs, **kwargs)¶ Adjusts hue, saturation, brightness and contrast of the image.
This operator allows sequence inputs and supports volumetric data.
- Supported backends
‘cpu’
‘gpu’
- Parameters
input (TensorList ('HWC', 'FHWC', 'DHWC')) – Input to the operator.
- Keyword Arguments
brightness (float or TensorList of float, optional, default = 1.0) –
Brightness change factor.
Values must be non-negative.
Example values:
0 - Black image.
1 - No change.
2 - Increase brightness twice.
Supports
per-frame
inputs.bytes_per_sample_hint (int or list of int, optional, default = [0]) –
Output size hint, in bytes per sample.
If specified, the operator’s outputs residing in GPU or page-locked host memory will be preallocated to accommodate a batch of samples of this size.
contrast (float or TensorList of float, optional, default = 1.0) –
Contrast change factor.
Values must be non-negative.
Example values:
0 - Uniform grey image.
1 - No change.
2 - Increase brightness twice.
Supports
per-frame
inputs.dtype (
nvidia.dali.types.DALIDataType
, optional) –Output data type.
If not set, the input type is used.
hue (float or TensorList of float, optional, default = 0.0) –
Hue change, in degrees.
Supports
per-frame
inputs.image_type (
nvidia.dali.types.DALIImageType
, optional, default = DALIImageType.RGB) – The color space of the input and the output image.preserve (bool, optional, default = False) – Prevents the operator from being removed from the graph even if its outputs are not used.
saturation (float or TensorList of float, optional, default = 1.0) –
Saturation change factor.
Values must be non-negative.
Example values:
0 - Completely desaturated image.
1 - No change to image’s saturation.
Supports
per-frame
inputs.seed (int, optional, default = -1) –
Random seed.
If not provided, it will be populated based on the global seed of the pipeline.