stscijgbot-hstdp

_Comment by [Steve Goldman](https://jira.stsci.edu/secure/ViewProfile.jspa?name=sgoldman) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=662216#comment-662216):_ I'm guessing then that this is more of a thresholding issue. Also please let me know if you would prefer me to upload things...

_Comment by [Jennifer Mack](https://jira.stsci.edu/secure/ViewProfile.jspa?name=mack) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=662265#comment-662265):_ Thanks, Steve.  I found these alignment parameters in the json file here: `    "generate_source_catalogs":` `      {` `        "box_size":13,` `        "win_size":3,` `        "nsigma":3.0,` `        "centering_mode":...

_Comment by [Rick White](https://jira.stsci.edu/secure/ViewProfile.jspa?name=rlw) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=662344#comment-662344):_ I don't know what the appropriate change is to the threshold, but it seems to me Jenn is probably correct that there is something...

_Comment by [Steve Goldman](https://jira.stsci.edu/secure/ViewProfile.jspa?name=sgoldman) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=662929#comment-662929):_ Okay, so moving forward I will try to compare the StdBackgroundRMS of u5c504 with other more normal programs. If the backgrounds are off, and...

_Comment by [Steve Goldman](https://jira.stsci.edu/secure/ViewProfile.jspa?name=sgoldman) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=662996#comment-662996):_ Attached is the background data ('bkg_image_data.fits') being used, calculated by photutils.background.Background2D. It looks like while the average value in the image seems to be...

_Comment by [Steve Goldman](https://jira.stsci.edu/secure/ViewProfile.jspa?name=sgoldman) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=663027#comment-663027):_ It seems that Chip 1 is the issue, with a background (0.7) far lower than the the rest (~5)

_Comment by [Rick White](https://jira.stsci.edu/secure/ViewProfile.jspa?name=rlw) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=663182#comment-663182):_ I'm looking at the u5c504 images. I confirm that the background is lower on the PC (chip 1), although it is not quite as...

_Comment by [Rick White](https://jira.stsci.edu/secure/ViewProfile.jspa?name=rlw) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=663183#comment-663183):_ From the [photutils background documentation](https://photutils.readthedocs.io/en/stable/_modules/photutils/background/core.html), it sounds like the `StdBackgroundRMS` algorithm uses a sigma-clipped RMS (if sigma-clipping is turned on). It might be a...

_Comment by [Steve Goldman](https://jira.stsci.edu/secure/ViewProfile.jspa?name=sgoldman) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=663312#comment-663312):_ Thanks for doing all of this Rick, I will give the MADStdBackgroundRMS method a go and report back what I find. 

_Comment by [Jennifer Mack](https://jira.stsci.edu/secure/ViewProfile.jspa?name=mack) on [JIRA](https://jira.stsci.edu/browse/HLA-1112?focusedCommentId=663482#comment-663482):_ Hi Steve, Adding a few comments from our conversation this afternoon: 1.) I'm concerned that the sky images (and stats) may be not using...