How to cut out monochrome objects from an image?

Question

PHP

Good day.
It is required to pull out light (white) pictures (almost monochrome in color) from here:

How would you advise me to do it? Maybe there is a solution? Imagemagick'om can somehow?
Preferably php,
thank you all for the time

Answer 1

www.imagemagick.org/Usage/masking/#bg_remove The
easiest way is to first generate the mask from white and then invert it.
Naturally, you will have to tinker to find the most suitable feathering settings, because the borders of the desired images are not clear, but blurry.