DGTonemap

Abstract
Author	Donald Graft
Version	v1.2
Download	DGTonemap.rar
Category	Adjustment Filters
License	Closed source
Discussion

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+.

Requirements

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

Syntax and Parameters

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.

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)

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)

Changelog

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

Archived Downloads

Version	Download	Mirror
v1.2	DGTonemap.rar	DGTonemap.rar

External Links

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