src/modules/Colormap/Colormap.js
/*
* Accepts a value from 0-255 and returns the new color-mapped pixel
* from a lookup table, which can be specified as an array of [begin, end]
* gradients, where begin and end are represented as [r, g, b] colors. In
* combination, a lookup table which maps values from 0 - 255 smoothly from black to white looks like:
* [
* [0, [0, 0, 0], [255, 255, 255]],
* [1, [255, 255, 255], [255, 255, 255]]
* ]
*
* Adapted from bgamari's work in Infragram: https://github.com/p-v-o-s/infragram-js/commit/346c97576a07b71a55671d17e0153b7df74e803b
*/
module.exports = function Colormap(value, options) {
var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
options.colormap = options.colormap || defaults.colormap;
// if a lookup table is provided as an array:
if(typeof(options.colormap) == 'object')
colormapFunction = colormap(options.colormap);
// if a stored colormap is named with a string like "fastie":
else if(colormaps.hasOwnProperty(options.colormap))
colormapFunction = colormaps[options.colormap];
else colormapFunction = colormaps.default;
return colormapFunction(value / 255.00);
};
function colormap(segments) {
return function(x) {
var i, result, x0, x1, xstart, y0, y1, _i, _j, _len, _ref, _ref1, _ref2, _ref3;
_ref = [0, 0], y0 = _ref[0], y1 = _ref[1];
_ref1 = [segments[0][0], 1], x0 = _ref1[0], x1 = _ref1[1];
if (x < x0) {
return y0;
}
for (i = _i = 0, _len = segments.length; _i < _len; i = ++_i) {
_ref2 = segments[i], xstart = _ref2[0], y0 = _ref2[1], y1 = _ref2[2];
x0 = xstart;
if (i === segments.length - 1) {
x1 = 1;
break;
}
x1 = segments[i + 1][0];
if ((xstart <= x && x < x1)) {
break;
}
}
result = [];
for (i = _j = 0, _ref3 = y0.length; 0 <= _ref3 ? _j < _ref3 : _j > _ref3; i = 0 <= _ref3 ? ++_j : --_j) {
result[i] = (x - x0) / (x1 - x0) * (y1[i] - y0[i]) + y0[i];
}
return result;
};
}
var colormaps = {
greyscale: colormap([
[0, [0, 0, 0], [255, 255, 255] ],
[1, [255, 255, 255], [255, 255, 255] ]
]),
bluwhtgrngis: colormap([
[0, [6, 23, 86], [6, 25, 84] ],
[0.0625, [6, 25, 84], [6, 25, 84] ], //1
[0.125, [6, 25, 84], [6, 25, 84] ], //2
[0.1875, [6, 25, 84], [6, 25, 84] ],
[0.25, [6, 25, 84], [6, 25, 84] ],
[0.3125, [6, 25, 84], [9, 24, 84] ], //5
[0.3438, [9, 24, 84], [119, 120, 162] ], //5
[0.375, [119, 129, 162], [249, 250, 251] ], //6
[0.406, [249, 250, 251], [255, 255, 255] ], //6.5
[0.4375, [255, 255, 255], [255, 255, 255] ], //7 white
[0.50, [255, 255, 255], [214, 205, 191] ], //8
[0.52, [214, 205, 191], [178, 175, 96] ], //8.2
[0.5625, [178, 175, 96], [151, 176, 53] ], //9
[0.593, [151, 176, 53], [146, 188, 12] ], //9.5
[0.625, [146, 188, 12], [96, 161, 1] ], //10
[0.6875, [96, 161, 1], [30, 127, 3] ], //11
[0.75, [30, 127, 3], [0, 99, 1] ], //12
[0.8125, [0, 99, 1], [0, 74, 1] ], //13
[0.875, [0, 74, 1], [0, 52, 0] ], //14
[0.9375, [0, 52, 0], [0, 34, 0] ], //15
[0.968, [0, 34, 0], [68, 70, 67] ] //16
]),
brntogrn: colormap([
[0, [110, 12, 3], [118, 6, 1] ],
[0.0625, [118, 6, 1], [141, 19, 6] ],
[0.125, [141, 19, 6], [165, 35, 13] ],
[0.1875, [165, 35, 13], [177, 59, 25] ],
[0.2188, [177, 59, 25], [192, 91, 36] ],
[0.25, [192, 91, 36], [214, 145, 76] ],
[0.3125, [214, 145, 76], [230, 183, 134] ],
[0.375, [230, 183, 134], [243, 224, 194]],
[0.4375, [243, 224, 194], [250, 252, 229] ],
[0.50, [250, 252, 229], [217, 235, 185] ],
[0.5625, [217, 235, 185], [184, 218, 143] ],
[0.625, [184, 218, 143], [141, 202, 89] ],
[0.6875, [141, 202, 89], [80, 176, 61] ],
[0.75, [80, 176, 61], [0, 147, 32] ],
[0.8125, [0, 147, 32], [1, 122, 22] ],
[0.875, [1, 122, 22], [0, 114, 19] ],
[0.90, [0, 114, 19], [0, 105, 18] ],
[0.9375, [0, 105, 18], [7, 70, 14] ]
]),
blutoredjet: colormap([
[0, [0, 0, 140], [1, 1, 186] ],
[0.0625, [1, 1, 186], [0, 1, 248] ],
[0.125, [0, 1, 248], [0, 70, 254] ],
[0.1875, [0, 70, 254], [0, 130, 255] ],
[0.25, [0, 130, 255], [2, 160, 255] ],
[0.2813, [2, 160, 255], [0, 187, 255] ], //inset
[0.3125, [0, 187, 255], [6, 250, 255] ],
// [0.348, [0,218,255], [8,252,251] ],//inset
[0.375, [8, 252, 251], [27, 254, 228] ],
[0.406, [27, 254, 228], [70, 255, 187] ], //insert
[0.4375, [70, 255, 187], [104, 254, 151]],
[0.47, [104, 254, 151], [132, 255, 19] ], //insert
[0.50, [132, 255, 19], [195, 255, 60] ],
[0.5625, [195, 255, 60], [231, 254, 25] ],
[0.5976, [231, 254, 25], [253, 246, 1] ], //insert
[0.625, [253, 246, 1], [252, 210, 1] ], //yellow
[0.657, [252, 210, 1], [255, 183, 0] ], //insert
[0.6875, [255, 183, 0], [255, 125, 2] ],
[0.75, [255, 125, 2], [255, 65, 1] ],
[0.8125, [255, 65, 1], [247, 1, 1] ],
[0.875, [247, 1, 1], [200, 1, 3] ],
[0.9375, [200, 1, 3], [122, 3, 2] ]
]),
colors16: colormap([
[0, [0, 0, 0], [0, 0, 0] ],
[0.0625, [3, 1, 172], [3, 1, 172] ],
[0.125, [3, 1, 222], [3, 1, 222] ],
[0.1875, [0, 111, 255], [0, 111, 255] ],
[0.25, [3, 172, 255], [3, 172, 255] ],
[0.3125, [1, 226, 255], [1, 226, 255] ],
[0.375, [2, 255, 0], [2, 255, 0] ],
[0.4375, [198, 254, 0], [190, 254, 0] ],
[0.50, [252, 255, 0], [252, 255, 0] ],
[0.5625, [255, 223, 3], [255, 223, 3] ],
[0.625, [255, 143, 3], [255, 143, 3] ],
[0.6875, [255, 95, 3], [255, 95, 3] ],
[0.75, [242, 0, 1], [242, 0, 1] ],
[0.8125, [245, 0, 170], [245, 0, 170] ],
[0.875, [223, 180, 225], [223, 180, 225] ],
[0.9375, [255, 255, 255], [255, 255, 255]]
]),
default: colormap([
[0, [45, 1, 121], [25, 1, 137] ],
[0.125, [25, 1, 137], [0, 6, 156] ],
[0.1875, [0, 6, 156], [7, 41, 172] ],
[0.25, [7, 41, 172], [22, 84, 187] ],
[0.3125, [22, 84, 187], [25, 125, 194] ],
[0.375, [25, 125, 194], [26, 177, 197] ],
[0.4375, [26, 177, 197], [23, 199, 193] ],
[0.47, [23, 199, 193], [25, 200, 170] ],
[0.50, [25, 200, 170], [21, 209, 27] ],
[0.5625, [21, 209, 27], [108, 215, 18] ],
[0.625, [108, 215, 18], [166, 218, 19] ],
[0.6875, [166, 218, 19], [206, 221, 20] ],
[0.75, [206, 221, 20], [222, 213, 19 ] ],
[0.7813, [222, 213, 19], [222, 191, 19]],
[0.8125, [222, 191, 19], [227, 133, 17] ],
[0.875, [227, 133, 17], [231, 83, 16] ],
[0.9375, [231, 83, 16], [220, 61, 48] ]
]),
fastie: colormap([
[0, [255, 255, 255], [0, 0, 0] ],
[0.167, [0, 0, 0], [255, 255, 255] ],
[0.33, [255, 255, 255], [0, 0, 0] ],
[0.5, [0, 0, 0], [140, 140, 255] ],
[0.55, [140, 140, 255], [0, 255, 0] ],
[0.63, [0, 255, 0], [255, 255, 0] ],
[0.75, [255, 255, 0], [255, 0, 0] ],
[0.95, [255, 0, 0], [255, 0, 255] ]
]),
stretched: colormap([
[0, [0, 0, 255], [0, 0, 255] ],
[0.1, [0, 0, 255], [38, 195, 195] ],
[0.5, [0, 150, 0], [255, 255, 0] ],
[0.7, [255, 255, 0], [255, 50, 50] ],
[0.9, [255, 50, 50], [255, 50, 50] ]
])
};