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      "name": "radial",
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                  "exponential": {
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              "bounds": [0.5],
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    },
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      "name": "checkerboard",
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          "space": "rgb",
          "function": {
            "calculation": {
              "domain": [[0.0, 1.0], [0.0, 1.0]],
              "range": [[0.0, 1.0], [0.0, 1.0], [0.0, 1.0]],
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      "rect": {
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        "lly": 770.0,
        "urx": 525.0,
        "ury": 791.6
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        "Gradients, and a colour read from a function"
      ],
      "font": "DejaVuSans",
      "font_size": 18.0
    },
    {
      "type": "rect",
      "rect": {
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        "urx": 280.0,
        "ury": 730.0
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      "fill": {
        "shading": "horizontal"
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      "type": "text",
      "rect": {
        "llx": 70.0,
        "lly": 545.0,
        "urx": 280.0,
        "ury": 557.0
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        "Axial, two colours"
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      "font": "DejaVuSans",
      "font_size": 10.0
    },
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      "rect": {
        "llx": 315.0,
        "lly": 545.0,
        "urx": 525.0,
        "ury": 557.0
      },
      "content": [
        "Axial, on the diagonal"
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      "font": "DejaVuSans",
      "font_size": 10.0
    },
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      "type": "rect",
      "rect": {
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        "lly": 320.0,
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        "ury": 490.0
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      "type": "text",
      "rect": {
        "llx": 70.0,
        "lly": 305.0,
        "urx": 280.0,
        "ury": 317.0
      },
      "content": [
        "Radial, outer extended"
      ],
      "font": "DejaVuSans",
      "font_size": 10.0
    },
    {
      "type": "rect",
      "rect": {
        "llx": 315.0,
        "lly": 320.0,
        "urx": 525.0,
        "ury": 490.0
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        "shading": "three_stops"
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    {
      "type": "text",
      "rect": {
        "llx": 315.0,
        "lly": 305.0,
        "urx": 525.0,
        "ury": 317.0
      },
      "content": [
        "Axial, three stops"
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      "font": "DejaVuSans",
      "font_size": 10.0
    },
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      "type": "rect",
      "rect": {
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        "lly": 100.0,
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        "ury": 270.0
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        "shading": "checkerboard"
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      "type": "text",
      "rect": {
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        "lly": 85.0,
        "urx": 525.0,
        "ury": 97.0
      },
      "content": [
        "Function-based: a checkerboard on x and y at once, anti-aliasing asked for"
      ],
      "font": "DejaVuSans",
      "font_size": 10.0
    }
  ]
}