Hi, I'm an artist trying to get estimates of grains and particles in backlit photographs.These images are possibly too basic for any tutorial out there. After days of playing with all the options I have hit a wall and turn to this forum to ask if anyone can help. Ideally I would post a sample image and ask someone to process it. But there doesn't seem to be that facility with this forum.
Any good Samaritans out there? I'm also open to suggestions of plugins

Thanks, Steve