tonemap_opencl

Perform HDR(PQ/HLG) to SDR conversion with tone-mapping.

It accepts the following parameters:

tonemap

Specify the tone-mapping operator to be used. Same as tonemap option in tonemap.

param

Tune the tone mapping algorithm. same as param option in tonemap.

desat

Apply desaturation for highlights that exceed this level of brightness. The higher the parameter, the more color information will be preserved. This setting helps prevent unnaturally blown-out colors for super-highlights, by (smoothly) turning into white instead. This makes images feel more natural, at the cost of reducing information about out-of-range colors.

The default value is 0.5, and the algorithm here is a little different from the cpu version tonemap currently. A setting of 0.0 disables this option.

threshold

The tonemapping algorithm parameters is fine-tuned per each scene. And a threshold is used to detect whether the scene has changed or not. If the distance between the current frame average brightness and the current running average exceeds a threshold value, we would re-calculate scene average and peak brightness. The default value is 0.2.

format

Specify the output pixel format.

Currently supported formats are:

p010

nv12

range, r

Set the output color range.

Possible values are:

tv/mpeg

pc/jpeg

Default is same as input.

primaries, p

Set the output color primaries.

Possible values are:

bt709

bt2020

Default is same as input.

transfer, t

Set the output transfer characteristics.

Possible values are:

bt709

bt2020

Default is bt709.

matrix, m

Set the output colorspace matrix.

Possible value are:

bt709

bt2020

Default is same as input.