AVSCube

Revision as of 09:37, 13 July 2023

Description

AviSynth+ plugin to load and apply Adobe 3D LUTs to a clip. Ported from VapourSynth timecube plugin.

Requirements

• AviSynth+ (x86 and x64)
• Supported color formats: RGBP16

Syntax and Parameters

Cube (clip, string "cube", int "cpu", int "interp", int "fullrange")

clip   =

Input clip; the filter receives and delivers the RGBP16 color space.

string  cube = ""

Full path of the 3D LUT file. This must be an Adobe *.cube file.

int  cpu = INT_MAX

cpu: default INT_MAX, which selects best SIMD.

• 0 : SIMD_NONE
• 1 : SIMD_SSE41
• 2 : SIMD_AVX2
• 3 : SIMD_AVX512

int  interp = 0

interp: default 0 selects the worse interpolation method for backwards compatibility reasons.

• 0 : trilinear interpolation
• 1 : tetrahedral interpolation

int  fullrange = 1

• 0 : limited range
• 1 : full range

Trilinear vs Tetrahedral

Trilinear interpolation is used by default only for historical reasons.
When Cube() was first developed it only had one interpolation method, namely trilinear.
Although this was far from ideal as it can produce ripples, plenty of people used it (as they were using this function), therefore when tetrahedral was introduced it was agreed to leave trilinear as default to allow people to still obtain the same results when upgrading the version.
However, in practice, tetrahedral should always be used and it's the suggested method.

Source (left) - Trilinear (center) - Tetrahedral (right):


As you can see, in the right hand side waveform (tetrahedral) there are no ripples, unlike the ones you can see in the trilinear interpolation at the center.

Examples

Apply 3D LUT to clip obtained from BlankClip:

BlankClip(pixel_type="RGBP16", color=$ff0000)
Cube("...\test.cube")
ConvertToYUV420()

Apply 3D LUT to HDR10 PQ clip obtained from DGSource() to go to HLG:

# Source
DGSource("THE GREAT WALL.dgi")

# From Limited Range 10bit YUV420 to 16bit Full Range Planar RGB
z_ConvertFormat(pixel_type="RGBP16", colorspace_op="2020:st2084:2020:limited=>rgb:st2084:2020:full", dither_type="error_diffusion")

# Load and apply "PQ_to_HLG.cube" to go from PQ to HLG
Cube("PQ_to_HLG.cube", fullrange=1, interp=1)

# From 16bit Full Range Planar RGB to Limited Range 10bit YUV420 with dithering
z_ConvertFormat(pixel_type="YUV420P10", colorspace_op="rgb:std-b67:2020:full=>2020:std-b67:2020:limited", dither_type="error_diffusion")

Changelog

Version         Date            Changes
v1.4            2023/07/12      - Added tetrahedral interpolation.
v1.3            2022/01/21      - Updated to timecube version 1.3 base code.
                                - Added frame properties passthrough.
                                - Updated the help document.
v1.1            2019/01/25      - Rather than upgrade to r2a I ported the fullrange fix only.
v1.0            2018/08/16      - Initial release

Archived Downloads

External Links

• Doom9 Forum - FranceBB LUT Collection
• GitHub - ColorMatch3D - tool that creates a .cube 3D LUT that matches colors of a reference image with a different grading. Discussion thread
• GitHub - hlg-tools - this tool suite consists of the basics needed to generate 3D LUTs that will convert video streams from Perceptual Quantizer (PQ) HDR into Hybrid-Log Gamma (HLG) HDR. Discussion thread, original discussion thread
• AMPAS CLF LUT PseudoCode - Walkthrough on different interpolation methods

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