Area calculation black and white photo

Hello

I am a beginner with Photoshop, and I would like to calculate the black box of a drawing.

I'm looking after a tutorial for 2 weeks, but I found nothing.

It is easy to calculate the area of the white background, but how can I do to the black outline?

Underneath, it's the drawing that I want the black bounding box:

face_ELPANEL.jpg

Please, could you explain to me how do? With photos if it is possible.

Thanks in advance,

Nice day!

The expanded view of the Panel histogram doesn't tell you how many pixels in a selection? (Window > histogram in the menu bar.) Then click on the button of the menu panel at the top right > view developed. Make sure together 'Source' to 'Selected sex' so that it is not aggregating all layers.)

Then, you'll make a selection of, say, the magic wand tool, or a combination of the selection tools.

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