Separate the portrait from the background

Separate the object, portrait from the background. I will prepare an image for you: I will change the background, make a transparent background, save it in the necessary resolution. I work in Adobe Photoshop using the distribution technique through "colour channels" or using the "pero" tool depending on the task.

With a complex separation where many details the number of processed photos is 10 pieces.
The number of photographs processed up to 50 pieces.