From c19fddc3ce9d9e9cc43a6ae3a30fab76140858c4 Mon Sep 17 00:00:00 2001 From: erazortt Date: Thu, 15 Feb 2024 14:48:10 +0100 Subject: [PATCH] Update README.md --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 0c15097..f1930c3 100644 --- a/README.md +++ b/README.md @@ -77,7 +77,7 @@ It is not expected to give good results for low brightness targets of 400 nits a The following arguments control the tonemapping function: - `masterMaxNits` and `masterMinNits` set the white and black brightness value of the source. The values for the master brightness can be either given explicitly or `masterMaxNits` and `masterMinNits` can both be set to `-1` which will indicate that the actual values are read from the related frame properties `_dovi_dynamic_max_pq` and `_dovi_dynamic_min_pq` which are set by [DoViBaker](#dovibaker) or [DoViStatsFileLoader](#dovistatsfileloader), leading to a dynamic tonemapping. If not given these will default to `-1`. - `targetMaxNits` and `targetMinNits` set the desired target capabilities. These must be given explicitly. -- `lumScale` changes the total brightness, this can be usefull since many HDR streams are actually too dark, darker then the respective SDR streams would be. This setting is especially important when converting to SDR! If however the equivalent SDR stream is already availble, the proper `lumScale` factor can be found by using the script [LumScaleHelper.avs](#lumscalehelperavs). It is also possible to read the luminosity factor from the frame property `_dovi_dynamic_luminosity_scale` by setting `lumSacle` to `-1`. When not given explicitly the default of `1.0` is used. +- `lumScale` changes the total brightness, this can be usefull since many HDR streams are actually too dark, darker then the respective SDR streams would be. If the equivalent SDR stream is available, the proper `lumScale` factor can be found by using the script [LumScaleHelper.avs](#lumscalehelperavs). This setting is especially important when converting to SDR using LUTs generated by [DoViLutGen](#dovilutgen). It is possible to read the luminosity factor from the frame property `_dovi_dynamic_luminosity_scale` by setting `lumSacle` to `-1`. When not given explicitly the default of `1.0` is used. - `kneeOffset` is a parameter of the tonemapping curve, which governs the size of the region where the tonemapping function is flattened (see figure below). The mathematical validity range is [0.5, 2.0]. In report BT.2408 this value is fixed at 0.5, which leads to low highlight details while favoring max brightness. Here the default value used is `0.75` which should be a better compromise overall, especially when using dynamic tonemapping. - `normalizeOutput` normalizes the output from the range `[targetMinNits, targetMaxNits]` to the full range. This can be usefull when the output is just an intermediate result which is further processed, since the usage of the full value range decreases rounding errors down the line. Default is `false`.