bugGNU Astronomy Utilities - Bugs: bug #63026, Warp translation adds one extra...


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bug #63026: Warp translation adds one extra pixel even if it is not requested

Submitter:  Raul Infante-Sainz <infantesainz>
Submitted:  Wed 07 Sep 2022 01:46:40 PM UTC
Category:  Warp Severity:  3 - Normal
Item Group:  Output not reasonable Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open

Wed 07 Sep 2022 01:46:40 PM UTC, original submission:  

The option '--translate' of Warp does not do what the user expect. When asked to translate only in the x-axis, it also translates the y-axis. To easily reproduce the problem consider the lines below:

Create an image to play with.

astmkprof --kernel gaussian,1,2 --output img.fits

Translate along the x-axis 1 pixel (tx=1), and check the dimensions. The result shows that also the y-axis has changed

astwarp img.fits --translate $tx,$ty --output warped_$tx-$ty.fits
astfits warped_$tx-$ty.fits

By modifying tx and ty other options can be explored. Interestingly, when using tx=ty=0, the result is correct.

Raul Infante-Sainz <infantesainz>
Group Member


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