Overview
This is supported at ArcGIS 10.1 and later.
This topic discusses JSON colorRamp objects. A colorRamp object is used to specify a range of colors that are applied to a group of symbols.
The following colorRamp definitions are discussed here:
Algorithmic color ramp
An algorithmic color ramp is defined by two colors and the algorithm used to traverse the intervening color space between them.
JSON syntax
{
"type": "algorithmic",
"fromColor": <color>,
"toColor": <color>,
"algorithm": <"esriHSVAlgorithm" | "esriCIELabAlgorithm" | "esriLabLChAlgorithm">
}
JSON example
{
"type": "algorithmic",
"fromColor": [115,76,0,255],
"toColor": [255,25,86,255],
"algorithm": "esriHSVAlgorithm"
}
Multipart color ramp
A multipart color ramp is defined by a list of constituent color ramps.
Note:
- A multipart color ramp cannot contain another multipart color ramp.
- At 10.1, a multipart color ramp supports only the algorithmic color ramp.
- At 10.6, a multipart color ramp supports the algorithmic color ramps with customized start and stop parameters in percentages numbers. These are optional parameters. Without using them, sub-colorramp will be evenly distributed in the colorRamps array’s order.
JSON syntax
{
"type": "multipart",
"colorRamps": [
{
"type": "algorithmic",
"fromColor": <color>,
"toColor": <color>,
"algorithm": <"esriHSVAlgorithm" | "esriCIELabAlgorithm" | "esriLabLChAlgorithm">
"start": <double>,
"stop": <double>
},
{
"type": "algorithmic",
"fromColor": <color>,
"toColor": <color>,
"algorithm": <"esriHSVAlgorithm" | "esriCIELabAlgorithm" | "esriLabLChAlgorithm">
"start": <double>,
"stop": <double>
}
]
}
JSON example
{
"type": "multipart",
"colorRamps": [
{
"type": "algorithmic",
"fromColor": [255,0,0,255],
"toColor": [255,255,0,255],
"algorithm": "esriHSVAlgorithm">
"start": 0,
"stop": 33.3
},
{
"type": "algorithmic",
"fromColor": [0,255,255,255],
"toColor": [0,0,255,255],
"algorithm": "esriHSVAlgorithm"
"start": 33.3,
"stop": 100
}
]
}