White background in Photoshop

How do you do it?
Here is one my workflows.

Color space is important, but we need to take extra care switching from one software to another (our camera is using software, so how many are considering that too?)

1. Use the color readout in Capture One to see if background is 255 white. If not, and I need to go to Photoshop, then I right click "edit with" photoshop to create a new file that will push out to Photoshop. I embed my camera profile and make photoshop respect the color space, so nothing changes.

2. I make a new layer and select an area outside the subject.

3. Fill the selection with white. This gives me a visual target for later steps.

4. Use the background layer to select my subject. Refine that selection.

5. Invert the selection so the background is selected (and subject masked).

6. Use the selection to create a curves layer.

7. Move the top-right point of the curves layer to the left until the rest of the background matches the white of the target layer (from 3).

8. Inspect all around my subject to see if the mask need refining or any other adjustments are needed.

9. Save and go back to Capture One. The new file is sitting in the same session with the origina raw.

This is how I do it in Capture One (without having to go to Photoshop)
https://headshotcrew.com/post/359633