# \#skysubtraction

**URL:** https://www.rubin.community/tag/skysubtraction/260.md

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## [Questions when skyCorr, scale factor too large](https://www.rubin.community/t/questions-when-skycorr-scale-factor-too-large/11456)

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**Author:** [@Yuanyu](https://www.rubin.community/u/Yuanyu)\
**Replies:** 2\
**Last updated:** [January 20, 2026, 1:54pm UTC](https://www.rubin.community/t/questions-when-skycorr-scale-factor-too-large/11456 "2026-01-20T13:54:04Z")

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Hello, recently, I am dealing with some HSC’s data, and when I do the skyCorr, and this is some of the log file: lsst.skyCorr INFO: Detector 103: Original background restored; BG median = 2319.6 counts, BG IQR = 197.9 c…

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## [Current sky subtraction method?](https://www.rubin.community/t/current-sky-subtraction-method/10816)

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**Author:** [@bryanwmiller](https://www.rubin.community/u/bryanwmiller)\
**Replies:** 1\
**Last updated:** [August 18, 2025, 6:13pm UTC](https://www.rubin.community/t/current-sky-subtraction-method/10816 "2025-08-18T18:13:54Z")

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What is the sky subtraction algorithm being used currently by the pipeline? It is using background matching from the 2020 algorithm workshop or are there any updates? Thanks.

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## [Setting up REPO for HSC with master calibrations, HSC sky subtraction](https://www.rubin.community/t/setting-up-repo-for-hsc-with-master-calibrations-hsc-sky-subtraction/9909)

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**Author:** [@gdb](https://www.rubin.community/u/gdb)\
**Replies:** 4\
**Last updated:** [March 18, 2025, 10:50pm UTC](https://www.rubin.community/t/setting-up-repo-for-hsc-with-master-calibrations-hsc-sky-subtraction/9909 "2025-03-18T22:50:51Z")

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Hello, Is there a detailed tutorial for how to set up and populate a Butler repository for HSC data? I’ve installed v28.0.1 and successfully run the introductory tutorial using the rc2\_subset of HSC data. What I’d lik…

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## [Failing constructSky in lsstSim because of sky correction defaults?](https://www.rubin.community/t/failing-constructsky-in-lsstsim-because-of-sky-correction-defaults/2835)

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**Author:** [@johannct](https://www.rubin.community/u/johannct)\
**Replies:** 5\
**Last updated:** [April 16, 2018, 7:23pm UTC](https://www.rubin.community/t/failing-constructsky-in-lsstsim-because-of-sky-correction-defaults/2835 "2018-04-16T19:23:31Z")

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Hi, following some discussion in DC2 land I am trying to see how to run this on lsstSim. I am failing with constructSky probably because I do not have the expected input : is it looking at specific input from the calib d…

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## [HSC defaults now require sky correction](https://www.rubin.community/t/hsc-defaults-now-require-sky-correction/2631)

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**Author:** [@price](https://www.rubin.community/u/price)\
**Replies:** 0\
**Last updated:** [January 30, 2018, 4:05pm UTC](https://www.rubin.community/t/hsc-defaults-now-require-sky-correction/2631 "2018-01-30T16:05:03Z")

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Following the merge of DM-13388, the visit-level sky subtraction introduced in DM-9147 is now required by default for warping HSC data. This means that if you are processing HSC with an LSST-DM stack version after w\_2018…

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## [Turn off sky substraction in HSC pipeline](https://www.rubin.community/t/turn-off-sky-substraction-in-hsc-pipeline/2542)

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**Author:** [@mmontes](https://www.rubin.community/u/mmontes)\
**Replies:** 5\
**Last updated:** [January 8, 2018, 1:33am UTC](https://www.rubin.community/t/turn-off-sky-substraction-in-hsc-pipeline/2542 "2018-01-08T01:33:24Z")

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Hi, I am re-reducing some archive images from HSC (using pipeline v5.4). Because of the kind of science I am doing, I need to do a different kind of image processing. For that, I need to deactivate the background correc…

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## [Sky subtraction](https://www.rubin.community/t/sky-subtraction/2415)

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**Author:** [@price](https://www.rubin.community/u/price)\
**Replies:** 0\
**Last updated:** [November 15, 2017, 7:10pm UTC](https://www.rubin.community/t/sky-subtraction/2415 "2017-11-15T19:10:40Z")

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I’ve just merged DM-9147, which contains support for improved sky subtraction. This is an implementation of the sky subtraction algorithm advocated by the Hyper Suprime-Cam team at NAOJ. The algorithm incorporates two el…