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PhotometricSuperflat

PixInsight module to create a photometric superflat

This module reads a table produced by the AperturePhotometry script, fits a polynomial surface (of degree up to 4) to the data and produces a photometric superflat frame as well as a couple of plots showing the relative flux errors in the calibration stars with and without the application of the flat. Here is a screenshot showing it in use:

https://dl.dropboxusercontent.com/u/110230258/SuperflatScreenshot.png

The easiest way to test it out is with simulated data. To do this, generate a fake image using the CatalogStarGenerator script, then modify this image with some function using the PixelMath module. (It's obviously important that you modify the image using some sort of multiplicative process and not an additive process). Run the AperturePhotometry script on the simulated image to generate a catalog. Then fire up the PhotometricSuperflat process and click on the button to select the catalog (whose filename will end with _WCS.csv). Drag the process icon onto the image you have just photometered to generate the Superflat and diagnostic plots.

Notes on modifying the source code

I find the trickiest part of creating PixInsight modules is handling parameters. When you add a new parameter you need to add appropriate code in these four files:

  • PhotometricSuperflatParameters

  • PhotometricSuperflatInterface

  • PhotometricSuperflatInstance

  • PhotometricSuperflatProcess [Note: instantiate the process parameters in the constructor or you will get a segfault]

License

This software is released under the PixInsight Class Library License Version 1.0

PixInsight Class Library License Version 1.0

Copyright (c) 2003-2011, Pleiades Astrophoto S.L. All Rights Reserved.

Redistribution and use in both source and binary forms, with or without modification, is permitted provided that the following conditions are met:

  1. All redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

  2. All redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

  3. Neither the names "PixInsight" and "Pleiades Astrophoto", nor the names of their contributors, may be used to endorse or promote products derived from this software without specific prior written permission. For written permission, please contact [email protected].

  4. All products derived from this software, in any form whatsoever, must reproduce the following acknowledgment in the end-user documentation and/or other materials provided with the product:

    "This product is based on software from the PixInsight project, developed by Pleiades Astrophoto and its contributors (http://pixinsight.com/)."

    Alternatively, if that is where third-party acknowledgments normally appear, this acknowledgment must be reproduced in the product itself.

THIS SOFTWARE IS PROVIDED BY PLEIADES ASTROPHOTO AND ITS CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PLEIADES ASTROPHOTO OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, BUSINESS INTERRUPTION; PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; AND LOSS OF USE, DATA OR PROFITS) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.