[gnuastro-devel] [bug #57024] Bad stich, full of NaNs, when using crop (version 0.8.36-9e13)

[Roberto Baena Gallé]

URL:
  <https://savannah.gnu.org/bugs/?57024>

                 Summary: Bad stich, full of NaNs, when using crop (version
0.8.36-9e13)
                 Project: GNU Astronomy Utilities
            Submitted by: rbaena
            Submitted on: mié 09 oct 2019 11:32:56 UTC
                Category: Crop
                Severity: 3 - Normal
              Item Group: Output not reasonable
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

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Details:

A bright star covers positions in two different images. I am trying to create
one single image centered around the star from the first two. 

The following line gives a correct result

$> astcrop --mode=wcs --zeroisnotblank --center=150.43153,2.2918385
--width=1200/3600,600/3600 -h1 calexp-HSC-I-9813-3,?-dud-align.fits
--output=output_good.fits


However, if I reverse the orientation of the rectangle box, pixels
corresponding to the lower image are full of NaN, when they should appear in
the final image since they lie within the box

$> astcrop --mode=wcs --zeroisnotblank --center=150.43153,2.2918385
--width=600/3600,1200/3600 -h1 calexp-HSC-I-9813-3,?-dud-align.fits
--output=output_bad.fits


P.S.: original images were aligned using warp

$> astwarp --align calexp-HSC-I-9813-3,5-dud.fits
--output=calexp-HSC-I-9813-3,5-dud-align.fits
$> astwarp --align calexp-HSC-I-9813-3,4-dud.fits
--output=calexp-HSC-I-9813-3,4-dud-align.fits

P.S.: it would be nice to be able to use the option --noblank option in wcs
mode to remove NaN values.




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