Now that's an interesting concept ...
Windows Paint allows editing of PNG files (which the HB snapshots are formatted as) ...but that's not really the same as being able to adjust the image criteria ...
There is the option of adjusting the image factors on the unit itself ... Simply "Freeze" the screen scroll (during live operation or during a recording playback) and adjust any of the settings ...
I have "Art Studio" on my iPhone that has many adjustments to any image ... But that's still not really like being able to adjust the Sensitivity setting after the fact ...
----
I could definitely see the benefit in your query myself ...maybe someone has an idea ...
Rickie