Fillsky should work  for those problems --  any area *above* the detected 
end of sky which is black (i.e. r,g,b all 0), or alpha < 1. will be filled 
with the modelled esimate of the sky color.   But the trick will be to 
apply a test mask (-tm <left> <right> <top> <bottom>) to the area so the 
end of sky detection doesn't stop on those areas.   As I write this I 
realize there'd be some situations like yours where Skyfill should by 
default doesn't stop on black or transparent areas during end of sky 
detection.   Currently it does stop because there can be areas at the left 
and right edges of panaromas that are transparent after the crop, and the 
barrel distortion correction has left a concave area which I'd assume a use 
might want to repair in postprocessing after running Skyfill.

I have to get part 2 of the Tutorial done, but there is an example of the 
test mask usage in the first part of the Tutorial.   If your dirt spots are 
always in the same place it should be pretty easy to "can" the test mask 
flag in a script and run on multiple files.

I'd be happy to help show you on a particular image if you'd like.   I 
wouldn't mind having another test case too ;-)

On Friday, March 4, 2022 at 10:51:50 AM UTC-8 [email protected] wrote:

> I have many small isolated gaps in the sky of my photos from my recent 
> vacation.  That is a bit different from the example use of FillSky.
>
> Given how many different things I'm trying to learn to use at once now, 
> I'd appreciate knowing whether FillSky is the right tool before I take time 
> to figure out how to use it.  (At a quick first look, it was not obvious to 
> me how to use it).
>
> I got dirt on the sensor of my camera at the start of my vacation (I'm not 
> used to this type of camera) and the air bulb I had could not blow the dirt 
> off and I didn't have a cleaning kit.  So all my photos have dirt spots.
>
> I can mask out the dirt spots where the matter and in non-sky areas of 
> panoramas there is typically overlap with the photo above that can replace 
> the masked out bit.  But for sky sections (where the dirt is most visible) 
> there is no photo above.  So the mask leaves a gap in the final panorama.
>
> Does FillSky automatically find and fill gaps in the sky?  Or can it 
> easily be told to?  Or is it just for sky gaps created by a ragged top to 
> the whole panorama?
>

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