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_Issue [JP-3758](https://jira.stsci.edu/browse/JP-3758) was created on JIRA by [David Law](https://jira.stsci.edu/secure/ViewProfile.jspa?name=dlaw):_
MRS master background currently averages over …
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- [ ] basic sky subtraction
- [ ] Kelson, 2003, PASP 115
- [ ] Does ABBA-style sky subtraction in the NIR fall under basic imaging reduction?]
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without `--invert` , vis-subtract will throw an error `No sources were specified for subtraction` for a perfectly valid seeming command like
```
hyperdrive vis-subtract -n ${num_sources} ...
```
…
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In the PCA sky subtraction developed by Wild & Hewett for SDSS spectra a spectral feature mask was utilised, so that spectra with emission lines at known places would not change the amplitudes to favo…
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In general, the sky subtraction is doing quite well. In visual inspections of the LRG spectra, I've noticed only a few cases in tile 68002 where the sky residuals are leading to confusion in the reds…
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Right now, in the zogy subtraction code, we set the `lim_mag_estimate` of the sub image to just be the same as the new image.
If (a) the ref image is a lot deeper than the new image, and (b) the ref …
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**Is your feature request related to a problem? Please describe.**
I'm always frustrated when I realise that sky flats (and sky subtraction) will not work in realtime as wellcurrently formulated
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From Dec'22 quarterly update
- Investigate the viability of a second-order solution proposed by DM called "background matching" for possible use in full survey.
- this was a stretch goal for Phase …
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This is a placeholder list of possible QC tests for AARTFAAC images. These might be different from those applicable to LOFAR images due to several reasons:
- Image noise dependent on LST of observatio…
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Almost all the photometric codes perform some type of sigma clip in sky annulus before calculate the sum. SExtractor also make it, but SEP miss this feature. Some background subtraction problems appea…