PixInsight Limited Edition (LE) is a freeware subset of the PixInsight project. It allows you to perform some basic image processing and is also an introductory preview to the full standard edition that will we available as a commercial product before the end of the year.
PixInsight LE includes exactly the same 32-bit IEEE floating point processing engine, the same powerful, object-oriented user interface, and some of the high-precision fundamental processing tools that are being implemented in the full version of PixInsight.
Following the tradition started by Pleiades Astrophoto with their widely used SGBNR (Selective Gaussian Blur Noise Reduction) application, PixInsight LE is also focused on noise reduction, including a new, highly improved implementation of the SGBNR algorithm. A limited but efficient version of the powerful à trous wavelet transform process has also been included to address the task of noise reduction at smaller scales. Finally, optimized implementations of the median and minimum/maximum filters, and the addition of the SCNR (Subtractive Chromatic Noise Reduction) algorithm, complete a set of noise reduction tools to meet the needs of virtually any astrophotographic work.
Added values are the histogram manipulation and curves adjustment tools, as well as the entire set of geometric transforms included in PixInsight Standard. With the exception of the à trous wavelet transform, the rest of tools and processes included in PixInsight LE are the same ones that can be found in the full standard edition as of the date of release.
To learn mor you can review the Online Documentation. There is also a printable PDF version of the online documentation (download size: 8.62 MB), but it lacks some interactive functionality that requires JavaScript code.