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  1. Data Management
  2. DM-14910

Firefly zscale differs from other implementations

    Details

    • Type: Bug
    • Status: Done
    • Resolution: Done
    • Fix Version/s: None
    • Component/s: Firefly, SUIT
    • Labels:
    • Templates:
    • Story Points:
      2
    • Sprint:
      SUIT Sprint 2018-07
    • Team:
      Science User Interface

      Description

      The upper output (z2) of Firefly's zscale implementation is often significantly greater than z2 from other implementations, including those in ds9, astropy and lsst.afw.display.

      Comparison on coadd file calexp-HSC-I-9813-4,4.fits:

      Implementation Contrast (%) Nsamples Samples_per_line z1 z2
      Firefly 25 600 120 -0.0491993 0.409582
      ds9 25 600 120 -0.0491993 0.145803
      lsst.afw.display.displayLib 25 600 N/A -0.0577342 0.155637
      astropy.visualization 25 600 N/A -0.0550090 0.170189
      Firefly 25 1000 120 -0.0487988 0.951774
      ds9 25 1000 120 -0.0487988 0.15138
      lsst.afw.display.displayLib 25 1000 N/A -0.0577120 0.165587
      astropy.visualization 25 1000 N/A -0.0535599 0.171046
      Firefly 80 600 120 -0.0379127 0.132309
      ds9 80 600 120 -0.0373926 0.0524557
      lsst.afw.display.displayLib 80 600 N/A -0.0392628 0.0535469
      astropy.visualization 80 600 N/A -0.0437599 0.0578543

       

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              • Assignee:
                shupe David Shupe
                Reporter:
                shupe David Shupe
                Watchers:
                David Shupe, Tatiana Goldina, Trey Roby, Xiuqin Wu [X] (Inactive)
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                • Created:
                  Updated:
                  Resolved:

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