range selection ranges

[tommy_nawratil]

hi,

at range selection we can define lower and upper limit, and we can refine by softening and "fuzziness".
It would help a lot if we could define ranges instead, like blend in start and blend in end,
and blend out start and blend out end, each with progressive transitions in between.
Masks could be tailored more precise using measured brightnesses, and the process would win a lot.

With range selection as it is now, we can soften it and edges of the mask become blurred,
but that is never as precise as "I want it up to this brightness and then fade out the effect until that brightness".
Because blurring is not structure sensitive, as brightness is in astronomical objects.

thanks Juan if you pick up the idea, I think its not a big work. 

Tommy

[tommy_nawratil]

Gerald OldWexi asked me about: 
"Because blurring is not structure sensitive, as brightness is in astronomical objects."

Softening means the selected structure is getting less defined.
If we had a transition between two brightnesses instead, the structure gets more defined.
Softening could be applied to taste after anyway.

One simple example: We can select star halos by range selection, defining the cutoff point to the background via the lower slider,
and exclude the star core by the upper slider. We get as a result the star halos selected in pure white.
We can soften that, but that means the selection smears out in either direction, into the core and into the background. Structure less clear.

If we could have the two points and a transition in between, we would end with selected halos that are bright near the (excluded) star core and fade out to the background.
Big difference it is!

Being able to split the lower and the upper point into a range each would make range selection even a more precise masking tool.

Tommy

[RickS]

we would end with selected halos that are bright near the (excluded) star core and fade out to the background.

You can achieve something like this by multiplying the RangeSelection mask by the original image.

Cheers,
Rick.