https://photo.stackexchange.com/questions/2834/does-photoshop-have-an-equivalent-to-gimps-color-to-alpha https://photo.stackexchange.com/questions/2834/does-pho

https://photo.stackexchange.com/questions/2834/does-photoshop-have-an-equivalent-to-gimps-color-to-alpha https://photo.stackexchange.com/questions/2834/does-photosho... Same process works for Photopea.