Default ICC Profile: Sets a profile to use if a file has no profile assigned to it. We recommend sRGB if you're not sure since most non-ICC capable cameras would be using an sRGB-like colorspace.

Color manage thumbnails for display: Applies color management to the contact sheet view.

Color manage previews for display: Applies color management to the preview.

Embed ICC Profile into Camera JPEGs during copy or ingest: Causes Photo Mechanic to embed the actual ICC profile into your images during copy or ingest operations.