Resize

Resize layer (resize) resizes data (image + annotation) to the certain size.

{
  "action": "resize",
  "src": ["$data1"],
  "dst": "$data2",
  "settings": {
    "width": 800,
    "height": 600,
    "aspect_ratio": {
      "keep": true
    }
  }
}

• "aspect_ratio": "keep" — flag (true or false). If true result should save original proportions.

• width — width in pixels or -1. If value is equal to -1 and "keep": true then for specific height width will be automatically computed to keep aspect ratio. The case when value is equal to -1 and "keep": false is not allowed.

• height — height in pixels or -1. If value is equal to -1 and "keep": true then for specific width height will be automatically computed to keep aspect ratio. The case when value is equal to -1 and "keep": false is not allowed.

Use case: resize to specific width

{
  "action": "resize",
  "src": ["$data1"],
  "dst": "$data2",
  "settings": {
    "width": 800,
    "height": -1,
    "aspect_ratio": {
      "keep": true
    }
  }
}

Result will be the following:

Height will be automatically computed and it is 600 px in this example.

Use case: resize to specific height

{
  "action": "resize",
  "src": ["$data1"],
  "dst": "$data2",
  "settings": {
    "width": 400,
    "height": 300,
    "aspect_ratio": {
      "keep": true
    }
  }
}

Result will be the following:

Width will be automatically computed and it is 400 px in this example.

Use case: resize to specific width and height without keeping aspect ratio

{
  "action": "resize",
  "src": ["$data1"],
  "dst": "$data2",
  "settings": {
    "width": 2000,
    "height": 500,
    "aspect_ratio": {
      "keep": false
    }
  }
}

Result will be the following:

Use case: resize to specific width and height with keeping aspect ratio

{
  "action": "resize",
  "src": ["$data1"],
  "dst": "$data2",
  "settings": {
    "width": 2000,
    "height": 500,
    "aspect_ratio": {
      "keep": true
    }
  }
}

Result will be the following:

As we can see, additional black padding is added to save both certain image size (width=2000 and height=500) and original proportions.