Astronomy work with Krita

[Stephen Williams]

JL VT wrote:
> A Mac user interesting in Krita!, This is great news  :)

I'm interested, but it is a struggle. The fink package of kde4 seems to
be broken and I'm trying to get that worked out. So I haven't even been
able to run Krita on my mac. All my research has been done by reading
documentation, and running a 1.6 version of Krita on my openSUSE 10.3
work system.

>> The images I work with are RGB48 from a Nikon D80 camera, so they
>> are fairly large. Then I will want to build up a stack of them,
>> typically a half dozen or dozen images, and also combine a few
>> dark field shots. The processing would amount to aligning each
>> image, adding them to a stack, subtracting out the dark-field
>> images, then tone-mapping the results.
> 
> Aligning -> I haven't done this before, but aligning an image with
> another based on their limits sounds very doable and simple. Even if
> it wasn't supported (I doubt it) it could be done hackishly by
> blitting a layer into another that's correctly aligned.

I know how to do phase correlation to automatically calculate alignment,
so that is not an issue. Given one reference image, other images may
shift up/down/left/right fractions of pixels to be perfectly aligned.
I am assuming that there is some sort of remap that is possible. If
not, I can also implement the shift.

> Adding them to a stack -> KisImage, the class that controls images in
> Krita, is a stack, so this is doable and should be simple.

Hmm... It might work to be able to derive from KisImage to create a
stack type that is specifically for my stacking. Or is there a "stack"
class that I can derive from to make my kind of stack? Somehow I recall
from the doxygen documentation that there might be something along
those lines. Perhaps I'm thinking of the layers class?

--steve