Hello everyone! This might be a little unconventional. I'm a researcher and I need to isolate the red from some pictures I took (samples bellow). The problem is that the red of the vessels is not strong enough for the quantification software (AngioTool) to identify what's a vessel and whats the background. It doesn't have to be red, It just need to be different enough from the background. I've been messing with the luminosity with the plugin Curves+ but is not enough. Any help of how could I do this? Any help would be really appreciated! The second picture is similar to what I need.