[AstroPy] problem with composed maps and fits files

Evangelia Samara evangelia.sam at gmail.com
Sat Jan 30 13:02:17 EST 2021

Hi Madison,

I want to take the data I see in the composited map. Is that what you mean
by rasterizing?

Namely, If I have an initial black image (full of zeros) and I overplot it
with an image which is *half* in size containing a white (full of 1s)
rectangle, I want to obtain the data of the final image which is a black
background (the initial image) with a white rectangle (the second image).
In this final image, the originally black pixels have been replaced with
white pixels where appropriate.

I hope its more clear now!


On Sat, Jan 30, 2021 at 6:20 PM E. Madison Bray <erik.m.bray at gmail.com>

> On Fri, Jan 29, 2021 at 9:30 AM Evangelia Samara
> <evangelia.sam at gmail.com> wrote:
> >
> > Dear,
> >
> > I would very much appreciate your help in the following, I am stuck to
> this problem for a long time.
> >
> > I want to composite two sunpy Maps together, obtain the composited data
> in a new fits file and save them. I have tried everything but i cannot
> obtain somehow the composited data together (there is no such function as
> comp_map.data, for example). Using get.data() function will only give me
> the data of the one or the other map, separately, while I want the new
> overplotted data all together.
> >
> > Do you maybe have a solution on this?
> >
> > Thank you very much in advance!
> Hi Evangelina,
> What exactly do you mean by "obtain the composited data in a new FITS
> file"?  As I understand it, from both the documentation and looking at
> the code, the CompositeMap just saves a list of multiple maps, and
> when plotting them overlays one on the other depending on their
> relative z-order.
> Do you just want the rasterized pixels of the resulting RGB image?
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