First, I am not an expert in photography, but a programmer. I am currently programming a camera for Exposure fusion, mixing maybe 3 images with different shutter speed.
I am looking for an optimal solution for automating this part. My base idea is that 3 photos should be enough and that one of the photos should use a shutter speed from auto mode. Then based on if the auto value is one the lower or higher end of shutter speeds I am choosing different approaches.
For example, if auto value is on the higher end I choose two lower values on the other two photos. The idea behind this is that I am wasting one of the 3 available photos if I take another photo in the "higher end".
The question is if this is the correct approach and if there is any recommendation based on this?
As an example we could say that we have shutter speeds of 1-10. What algorithm should we use to set shutter speed on the other two photos for each auto value of 1 to 10.
Keep in mind that this will be an automatic calculation and no user will control this.