※スポットカラー（特色）とは、印刷業界で用いられる用語で、CMYK（シアン、マゼンタ、イエロー、ブラック）の4色以外の特殊な色を指します

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CreateSpotSwatch.jsx

DESCRIPTION

Create a new spot color swatch in the general swatch group
and apply a tint of the new spot swatch to a new path item.
一般スウォッチグループに新しいスポットカラースウォッチを作成し、
新しいパスアイテムに新しいスポットスウォッチの色合いを適用します。
 
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var docRef = app.documents.add(DocumentColorSpace.CMYK);

var spotName = "CreateSpotSwatch";

// Create CMYKColor
var cmykColor = new CMYKColor();
cmykColor.cyan = 10;
cmykColor.magenta = 35;
cmykColor.yellow = 50;
cmykColor.black = 5;

// Create Spot
var spot = docRef.spots.add();
spot.color = cmykColor;
spot.colorType = ColorModel.SPOT;
spot.name = spotName;

// Create new SpotColor using Spot created above and apply a 50% tint
var spotColor = new SpotColor();
spotColor.tint = 50; // 50% tint
spotColor.spot = spot;

// Apply the tinted spot swatch to a new path item
var pathRef = docRef.pathItems.rectangle (400, 200, 200, 100, false);
pathRef.filled = true;
pathRef.fillColor = spotColor;
pathRef.stroked = true;