AstrOmatic forum
matching an image to a reference image - Printable Version

+- AstrOmatic forum (https://www.astromatic.net/forum)
+-- Forum: AstrOmatic software (/forumdisplay.php?fid=3)
+--- Forum: SWarp (/forumdisplay.php?fid=5)
+--- Thread: matching an image to a reference image (/showthread.php?tid=1003)



matching an image to a reference image - streicher - 02-03-2015 17:26

Hi,

I want to match (i.e. rotate and resample) an image to a given reference image without any co-adding.
For this, I have extracted and saved the header from the reference image. But still, when I run swarp, the result is rotated with respect to the reference image; the image size and pixel scale seem to be correct.

Does swarp recognize CROTAx keywords?
Is it a problem, when the image axes (x,y) are not parallel to the coordinate axes (ra,dec)?

What else could be cause the problem?