DBE/ABE when no Background is visible

[rdryfoos]

If I am imaging a diffuse nebula region with a limited FOV and there is no real background visible--should I use ABE with the normalized box checked?  Or is there a way to use DBE under these conditions? 

Thanks,
Rodd

[Stu]

I generally use ABE.

[aworonow]

If there is no background visible (or very little visible, or visible in just a few not-well-distributed areas), then how would one find gradients in the "background?" Don't think it either ABE or DBE can be used.

Alex W

[rdryfoos]

That is not what Vicent says--I just forgot what exactly he said.  Besides--gradients are not only in background, and DBE is not only for gradients.   
Rodd

[llpastro]

I probably knew this at one time but have since forgotten.  For what is DBE used besides gradients?

Larry

[rdryfoos]

I probably knew this at one time but have since forgotten.  For what is DBE used besides gradients?

Larry

  Well--not sure--but I remember Vicent indicating that you could use DBE JUST in gradient mode, which implies there is another use.  But, gradients transcend the background--color gradients can cross over into high signal areas.  DBE helps with contrast between light and dark areas (dark struvtures and emission areas).
Rodd