DGTonemap

Latest revision as of 19:57, 25 June 2020

[edit] Description

DGTonemap provides filters for Reinhard and Hable tonemapping operators. This is a starting point to make available a full HDR->SDR process for AviSynth+.

[edit] Requirements

• AviSynth+ (x86 and x64)
• Supported color formats: RGBPS

[edit] Syntax and Parameters

[edit] Reinhard Usage

DGReinhard (clip, float "contrast", float "bright")

clip   =

Input clip; the filter receives and delivers the RGBPS color space. See z_ConvertFormat() in the sample script below.

float  contrast = 5.0

Contrast

float  contrast = 0.3

Higher numbers for bright reduce brightness, you can even go to bright=1000 and beyond, but it stops having an effect up there.

[edit] Hable Usage

DGHable (clip, float "exposure", float "a", float "b", float "c", float "d", float "e", float "f", float "w")

clip   =

Input clip; the filter receives and delivers the RGBPS color space. See z_ConvertFormat() in the sample script below.

float  exposure = 2.0

Gain to apply.

float  a = 0.15

a: Shoulder strength

float  b = 0.50

b: Linear strength

float  c = 0.10

c: Linear angle

float  d = 0.20

d: Toe strength

float  e = 0.02

e: Toe numerator

float  f = 0.30

f: Toe denominator

float  w = 11.2

w: Linear white point

hable(x) = ((x*(a*x+c*b)+d*e) / (x*(a*x+b)+d*f)) - e/f

output_pixel = hable(exposure * input_pixel) / hable(w)

[edit] Examples

Following is a sample script for the full HDR->SDR process. The source UHD video is tonemapped, converted to rec709 colorspace, and downsampled to 8 bits. To leave it in 16 bits, set pixel_type=YUV420P16 in the second z_ConvertFormat() call.

SetFilterMTMode("z_ConvertFormat", MT_MULTI_INSTANCE) # May not be needed.
DGSource("THE GREAT WALL.dgi",fulldepth=true)
ConvertBits(10) # Use 12 for 12-bit
z_ConvertFormat(pixel_type="RGBPS",colorspace_op="2020ncl:st2084:2020:l=>rgb:linear:2020:l", dither_type="none")
# Choose one of these:
DGReinhard()
#DGHable()
z_ConvertFormat(pixel_type="YV12",colorspace_op="rgb:linear:2020:l=>709:709:709:l",dither_type="ordered")
prefetch(4)

[edit] Changelog

Version         Date            Changes
v1.2            2018/04/18      - Latest release
v1.0                            - Initial release

[edit] Archived Downloads

[edit] External Links

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