If DefMetaFileBGColor = clNone, then metafiles are loaded with an alpha (transparent) background. Otherwise, they are loaded with the specified solid color background.
Default: clNone
Example
// Load EMF/WMF with a white background IEGlobalSettings().DefEMFBackgroundColor := clWhite; ImageEnView1.IO.LoadFromFile( 'C:\input.wmf' );
// Which is the same as calling... ImageEnView1.IO.ImportMetaFile( 'C:\input.wmf', -1, -1, False, clWhite );
// Load EMF/WMF with a transparent background IEGlobalSettings().DefEMFBackgroundColor := clNone; ImageEnView1.IO.LoadFromFile( 'C:\input.wmf' );
// Which is the same as calling... ImageEnView1.IO.ImportMetaFile( 'C:\input.wmf', -1, -1, True );