If the file is a standard TIFF-CMYK file, just execute:
ImageEnView.IO.LoadFromFile('input.tif'); // for a page at the time
or
ImageEnMView.MIO.LoadFromFile('input.tif'); // to load all pages
If you want to apply the ICC color profile (if exists) set:
iegEnableCMS := true; // defined in imageenio unit
Finally if you want to leave the original CMYK pixels (instead of converting them to RGB 24) set:
ImageEnView.IO.NativePixelFormat := true;
ImageEnView.LegacyBitmap := false;
All properties must be set before loading.