ThemeColor

//Instantiating a Workbook object
var workbook = new aspose.cells.Workbook();
var cells = workbook.getWorksheets().get(0).getCells();
cells.get("A1").putValue("Hello World");
var style = cells.get("A1").getStyle();
//Set ThemeColorType.Text2 color type with 40% lighten as the font color.
style.getFont().setThemeColor(new aspose.cells.ThemeColor(aspose.cells.ThemeColorType.TEXT_2, 0.4));
style.setPattern(aspose.cells.BackgroundType.SOLID);
//Set ThemeColorType.Background2 color type with 75% darken as the foreground color
style.setForegroundThemeColor(new aspose.cells.ThemeColor(aspose.cells.ThemeColorType.BACKGROUND_2, -0.75));
cells.get("A1").setStyle(style);
//Saving the Excel file
workbook.save("Book1.xlsx");