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Below is a summary of the major changes with each new tagged version of GalSim. Each version also includes various other minor changes and bug fixes, which are not listed here for brevity. See the CHANGLELOG.md files associated with each version for a more complete list. Issue numbers related to each change are given in parentheses.

v1.0.1

  • Fixed some bugs in the config machinery when files have varying numbers of objects. (#487)
  • Support astropy.io.fits in lieu of stand-alone pyfits module. (#488)
  • Fixed a bug in config where 'safe' objects were not being correctly invalidated when a new input item should have invalidated them.
  • Fixed a bug in the drawing of a Pixel all by itself. (#497)

v1.0

  • Notable bug fixes and improvements:

    • Fixed bug in the rendering of shifted images. (#424)
    • Improved the fidelity of the Lanczos conserve_dc=True option. (#442)
    • Switched default interpolant for RealGalaxy to Quintic, since it was found to be more accurate in general. (#442)
    • Fixed a bug in InterpolatedImage calculateStepK function. (#454)
    • Fixed a bug in Image class resize function. (#461)
    • Sped up OpticalPSF and RealGalaxy significantly. (#466, #474)
    • Fixed a bug in the fourier rendering of truncated Sersic profiles. (#470)

  • Added galsim executable (instead of galsim_yaml, galsim_json). (#460)

  • Updates to functionality of specific classes and functions:

    • Updated the allowed range for Sersic n to 0.3 -- 6.2. (#325)
    • Made RealGalaxy objects keep track of their (correlated) noise. (#430)
    • Changed noise padding options for RealGalaxy and InterpolatedImage. (#430)
    • Added VariableGaussianNoise class. (#430)
    • Added offset parameter to both draw and drawShoot. (#439)
    • Changed the name of InputCatalog to just Catalog. (#449)
    • Added Dict class. (#449)

  • Updates to config options:

    • Added RealGalaxyOriginal galaxy type. (#389)
    • Added whiten option for RealGalaxy objects. (#430)
    • Added Current type. (#430)
    • Added offset option in image field. (#449)
    • Added the ability to have multiple input catalogs, dicts, etc. (#449)
    • Added signal_to_noise option for PSFs when there is no galaxy. (#459)
    • Added output.skip and output.noclobber options. (#474)

  • Updates to des module:

    • Added MEDS file output. (#376)
    • Removed des module from default imports of GalSim. Now need to import galsim.des explicitly or load with galsim -m des ... (#460)

v0.5

  • Updates to functionality of specific classes:

    • Added Shapelet class. (#350)
    • Added ability to truncate Sersic profiles. (#388)
    • Added trefoil and struts to OpticalPSF. (#302, #390)

  • Updates to lensing engine:

    • Added document describing how lensing engine code works. (#248)
    • Added ability to draw (gamma,kappa) from same power spectrum. (#304)
    • Added kmin_factor and kmax_factor parameters to buildGrid. (#377)
    • Added PowerSpectrumEstimator class in pse module. (#382)

  • Added GSParams (#343, #426) and HSMParams (#365) classes.

  • Added des module and example scripts. (#350)

  • Added applyWhiteningTo method to CorrelatedNoise class. (#352)

  • Changed the default centering convention for even-sized images to be in the actual center, rather than 1/2 pixel off-center. (#380)

  • Updates to config:

    • Added index_convention option. (#380)
    • Changed the name of the center item for the Scattered image type to image_pos, and added a new sky_pos item. (#380)

  • Added LINKFLAGS SCons option. (#380)

  • File I/O:

    • Enabled InputCatalog to read FITS catalogs. (#350)
    • Added FitsHeader class and config option. (#350)
    • Added the ability to read/write to a specific HDU. (#350)
    • Fix some errors related to writing to an HDUList. (#417)
    • Add new function galsim.fits.writeFile. (#417)

  • Basic bug fixes:

    • Fixed ringing when Sersic objectss were drawn with FFTs. (#426)
    • Fixed bugs in obj.drawK() function. (#407)
    • Fixed bugs with InterpolatedImage objects. (#389, #432)
    • Fixed bug in draw routine for shifted objects. (#380)
    • Fixed bug in the generation of correlated noise fields. (#352)

  • Deprecated AtmosphericPSF and Ellipse classes. (#372)

v0.4

  • Added ability to pad images for InterpolatedImage or RealGalaxy with either correlated or uncorrelated noise. (#238)

  • Added python-level LookupTable class which wraps the existing C++ Table class. (#305)

  • Lensing engine updates: (#305)

    • Added the option of drawing shears from a tabulated P(k)
    • Added ability to handle conversions between different angular units.
    • Fixed an important bug in the normalization of the generated shears.

  • Added a DistDeviate class. (#306)

  • Added galsim.correlatednoise.get_COSMOS_CorrFunc(...). (#345)

  • Added im.addNoiseSNR(). (#349)

  • Made a new Noise hierarchy for CCDNoise (no longer a BaseDeviate), GaussianNoise, PoissonNoise, DeviateNoise. (#349)

  • Added demo11 script. (#305, #306, #345)

v0.3

  • Fixed several bugs in the Sersic class that had been causing ringing. (#319, #330)

  • Added support for reading and writing compressed fits files. (#299)

  • Added InterpolatedImage class to wrap existing C++ level SBInterpolatedImage. (#333)

  • Added a new class structure for representing 2D correlation functions, used to describe correlated noise in images. (#297).

  • Add FormattedStr option for string values in config files. (#315)

  • Added obj.drawK() to the python layer. (#319)

  • Fixed several sources of memory leaks. (#327)

  • Updated the moments and PSF correction code to use the Image class and TMV; to handle weight and bad pixel maps for the input Images; and to run ~2-3 times faster. (#331, #332)

  • Fixed bug in config RandomCircle when using inner_radius option.

v0.2

  • Significant revamping and commenting of demos, including both python and config versions (#243, #285, #289).

  • Added python-level int1d function to wrap C++-level integrator, which allowed us to remove our dependency on scipy. (#288)

  • Significant expansion in config functionality, using YAML/JSON format config files (#291, #295).

  • Fixed some bugs in Image handling (including bugs related to duplicate numpy.int32 types), and made Image handling generally more robust (#293, #294).

  • Fixed bug in wrapping of angles (now not automatic -- use wrap() explicitly).

v0.1

Initial version of GalSim with most of the basic functionality.