and Astronomy

Welcome to Christian Buil home page

IRIS is a free software

How to install version 5.59 (June 24, 2010) :

         Download the zip file : IRIS.ZIP (size: 3.2 Mb)   —  Version en français ici : IRIS.ZIP

         Decompress the ZIP file in a directory of your choice

         Copy IRIS.EXE icon in your desktop

         Double-click on the IRIS icon for run the program

Support of DSRL raw file for Canon 6D, Sony alpha 7s, … (Sept. 19, 2014). Download the file libdcraw.zip and remplace in your IRIS installation directory the actual libdcraw.dll file by the new one.

Important tip: If after a new installation some dialog box disappear, do not panic. First method; (1) exit IRIS, (2) delete the IRIS.INI file from WiINDOW directory, (3) re-run IRIS. Second method: Execute RESET command from IRIS console and re-run.

Some feature…

Gamma display adjustment (curves function)

User manual

        Open and display an image file

        Adjust aspect of a B&W image

        Adjust aspect of a color image

        Save an image file



        Geometric transformations

        Preprocessing of grey level images (1/2)

        Preprocessing of grey level images (2/2)

        Make B&W master frames

        Align stellar images (automatic methods)

        Align stellar images (manual methods)

        Special alignment functions (field rotation, ...)

        Stack a sequence of images

        Diphering and optimal addition of a sequence of images

        Preprocessing of Digital SLR camera images

        Remove gradient of the sky background

        DSLR roadmap (preprocessing 2)

        Color / B&W conversions 

        Load and display a Digital SLR image

        Split a CFA image

        Color techniques

        (L)RGB techniques


        Console commands and scripts


        Astrometric reduction

        Sun processing

        Planetary processing

        Cosmetic corrections

        Atmospheric turbulence correction

        Wavelet analysis and noise filtering


        Blinking and animation

        Spectra preprocessing

        Image selection

        Modelisation by ellipse fitting

        Polarization analysis


        Flat-field extraction from science images

        Optimal subtraction

        Control of an equatorial mount

        Remote control of a DSLR camera

        Processing of cometary images

        Correct optical distortion

        Produce High Dynamic Range images (HDR)

Commands description

Command list (thanks Howard, Martin, Daren… for the compilation)

Command list  (en français + illustrations)

Command list - more recent (thanks Rolf)

Command list - Word version (thanks Javier)


A roadmap for a quick process of DSRL images

More about DSRL processing methods under IRIS

Preprocessing (YouTube - Maxime Simet)

Moon video processing (Dailymotion - Romain Pechereau)

Deep Sky processing (YouTube - Guillaume Doyen)







IRIS is a copyrighted freeware. IRIS is free of all rights for a non commercial usage and distribution. The software, the demonstration images and related documentation are exclusively properties of the author.

Web : www.astrosurf.com/buil

Copyright (C) 2021 Christian Buil