Of course? How else would you do it? Iterate through the pixels and check for certain blue values? And maybe a small greyish border area? How is that fancy en

Of course? How else would you do it? Iterate through the pixels and check for certain blue values? And maybe a small greyish border area? How is that fancy enough? (I remember helping ecology students with beginners programming, which was what they did, only that they had to check for green)