Hello Joe,
Background Remover is dedicated for processing images with complex background.
Of course, it can process images with simple one color matte or gradient background.
Open an image, create a layer and run Background Remover.
Mark background and object colors using marking tools (you can switch between marking object and background by pressing Ctrl button).
If your image has complex texture background check УTextured BackgroundФ flag.
Press УApplyФ, if background is not removed completely increase УStrengthФ parameter and press УApplyФ again.
In some cases you have to drop all marks using УDelete all marksФ tool and make a few additions marking stroke in hard places.
You can check result using one of colored matted background in the УViewФ section. Usually I use УCyan MatteФ, because all defects are more visible on this color.
If your result has small colored border around maskТs bounds or your object has semi-transparent areas (like hair, fur etc) you can use УDefringe toolФ. This tool marks area where Уcolor unmixingФ procedure will be applied. It means that in these areas Background Remover will УestimatesФ background and then УsubtractsФ estimated color from original with regard to calculated objectТs opacity. So, УDefringe toolФ is not simple erasing tool.
I try to illustrated Background Remover work on your examples.
I run Background Remover, mark object and background colors.

Pressing Apply I received the following result ( I used УCyan MatteФ background for defects checkingФ).

I used the УdefaultФ settings except checked УFill holesФ flag.
The result is good except areas around shoes.
I can use simple УManual EraserФ or УDefringe zoneФ tool.
I used the УdefaultФ settings except checked УFill holesФ flag.

Pressing Apply I received good extracted object.


PNG file you can download from
http://www.imageskill.com/tmp/result1.pngThe second image is:

PNG file you can download from
http://www.imageskill.com/tmp/result2.pngIf you have any questions, please write in our forum or to
support@imageskill.comRegards, Dmitry.