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Flat spectra occasionally show offset #1

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alexrudy opened this issue Sep 13, 2012 · 3 comments
Open

Flat spectra occasionally show offset #1

alexrudy opened this issue Sep 13, 2012 · 3 comments
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The flat spectra away from the center of the image seem to occasionally show a 2~3 pixel offset. This is especially true of un-centered items.

Examine SEDM-FWHM-sim-flat-2012-09-14.fits for an example.
@ghost ghost assigned alexrudy Sep 13, 2012
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Example (from SEDM-FWHM-sim-flat-2012-09-14.fits): http://cl.ly/image/373i0q0P1C3O

@alexrudy
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Here is a spectrum number labeled example. The offsets seem to primarily occur in the right (on-screen) direction on some spectra. http://cl.ly/1v2E1c390J0L

alexrudy added a commit to alexrudy/SEDMachine-Simulator that referenced this issue Sep 17, 2012
@alexrudy
Attempts to solve the offset problems in SEDMachine#1
44d193a 
- Printing region file to show canonical spectra position
- Exmaining offsets carefully
- Trying switching entirely to astype(np.int) instead of np.round
	(If this works, really we should use np.round() everywhere...)
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Arbitrary offset seems to have been fixed by commit b1668ca

http://cl.ly/1C081N2j2N0H

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