This galaxy made me think of a smallish M33! It has the same active HII regions and some faint Oiii regions that can be resolved well ; the core as a lot of details as well.

I started by doing a HOO version of this galaxy, then added as much as LRGB as I could. The challenge here was to gather enough Oiii that can at least balance a tad the HA regions - which in some areas worked!

📷 NGC2403_crop.jpgBelow you can see how the narrowband data is contributing to the overall image.

📷 NGC2403_transition.gif