Themes are the quick and easiest way to apply branding to SharePoint
sites. In SharePoint 2013 Themes got changed and redesigned as "Composed Look" feature. As it
sounds "Composed" look, it simply defines theming by combining design
elements: Master page - AKA site layout, Color theme, Font schemes and
background images. Read more: http://www.sharepointdiary.com/2014/12/sharepoint-2013-composed-looks-feature.html
Apply composed look programmatically in SharePoint 2013
If you want to uniformly apply the composed look which comprises of Master Page, Image file, Font schema to all sites, you can utilize PowerShell.
Add-PSSnapin Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue #Variables for processing $WebURL="http://portal.crescent.com/" $ColorPaletteURL="/_catalogs/theme/15/Palette015.spcolor" $FontSchemeURL="/_catalogs/theme/15/fontscheme005.spfont" $BackgroundImgURL="/_catalogs/theme/15/Tulips.jpg" #Get the Web $web = Get-SPWeb $WebURL #Apply theme $web.ApplyTheme($ColorPaletteURL, $FontSchemeURL, $BackgroundImgURL, $true) $web.Update()This applies the theme for given web.
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