Color-space conversion (cv::cvtColor), direction picked by the code enum. Convert to HSV before opencv_threshold to segment by brightness/saturation — a permanent fixture in grading and masking flows.

Module：OpenCV color & threshold · Task type：opencv_cvt_color

Ports

Inputs

PortTypeRequired
inImage / cv::Mat✓

Outputs

PortTypeRequired
outcv::Mat✓

Parameters

参数类型默认值范围 / 选项说明
codeenum612 options (see list below)

code Options（12）：

  • BGR2GRAY
  • GRAY2BGR
  • BGR2RGB
  • RGB2GRAY
  • BGR2HSV
  • HSV2BGR
  • BGR2HLS
  • BGR2LAB
  • BGR2LUV
  • BGR2YCRCB
  • YCRCB2BGR
  • BGR2XYZ

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": "opencv_cvt_color",
      "params": {
        "code": 6
      }
    },
    {
      "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"
    }
  ]
}

Notes

  • On 8-bit images OpenCV’s HSV hue range is 0-179, not 0-359.

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