DaVinci-style three-wheel grading: lift (shadows), gamma (midtones) and gain (highlights), each an RGB offset plus a master brightness. Given as comma-separated RGB + luminance components per wheel.

Module：Color grading · Task type：color_grade_wheels

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓

Outputs

PortTypeRequired
outcv::Mat✓

Parameters

参数类型默认值范围 / 选项说明
lift_rfloat0[-1, 1]
lift_gfloat0[-1, 1]
lift_bfloat0[-1, 1]
gamma_rfloat1[0.1, 4]
gamma_gfloat1[0.1, 4]
gamma_bfloat1[0.1, 4]
gain_rfloat1[0, 4]
gain_gfloat1[0, 4]
gain_bfloat1[0, 4]
offset_rfloat0[-1, 1]
offset_gfloat0[-1, 1]
offset_bfloat0[-1, 1]

Example graph

A minimal runnable pipeline (read → process → write). Drag it into GraphStudio or open via --open; replace data/test.png with a real path.

{
  "version": "2.0",
  "tasks": [
    {
      "id": "read",
      "type": "opencv_image_read",
      "params": {
        "file_path": "data/test.png"
      }
    },
    {
      "id": "node",
      "type": "color_grade_wheels",
      "params": {
        "lift_r": 0,
        "lift_g": 0,
        "lift_b": 0,
        "gamma_r": 1,
        "gamma_g": 1,
        "gamma_b": 1,
        "gain_r": 1,
        "gain_g": 1,
        "gain_b": 1,
        "offset_r": 0,
        "offset_g": 0,
        "offset_b": 0
      }
    },
    {
      "id": "save",
      "type": "opencv_image_write",
      "params": {
        "file_path": "out_out.png"
      }
    }
  ],
  "edges": [
    {
      "from": "read",
      "from_port": "out",
      "to": "node",
      "to_port": "in"
    },
    {
      "from": "node",
      "from_port": "out",
      "to": "save",
      "to_port": "in"
    }
  ]
}

Part of the GraphStudio node guide series; parameters reflect the latest release.