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Tutoriel sur le pré-traitement

Convertir vos images dans le format FITS utilisé par Siril (importation d'images)

Pour débuter le pré-traitement de vos images avec Siril, vous devez les convertir au format FITS (16-bit non signés, bottom-top, 1 ou 3 axes). Heureusement, Siril est capable de convertir plusieurs types d'images dans ce format : RAW, TIFF, JPEG, PIC (format de Iris, ©Christian Buil), PNG, BMP et NetPBM (binaires) pour les images, AVI pour les films.

First, the working directory has to be set. Images will be converted to this directory. Click on "Change dir" at bottom right of the window to change it or type cd [your directory] in the console input command.

Click on the "+" button to add the files to be converted. All supported formats can be selected at same time and will be converted in a sequence of files starting with the generic name you've specified just below. Created file names will be in the form Name_XXX, where XXX is the number of each image in the sequence. The button "Demosaicing" must be unchecked int order to convert RAW files into CFA (Color Filter Array) monochrome FITS pictures, a necessary step to pre-process DSLR images.

Siril conversion screen.png Siril conversion screen2.png

Indeed, due to Bayer matrix consideration, the RGB result of your RAW image is an interpolated picture. In consequence pre-processing interpolated data will give wrong results. Contrary to RGB image, CFA image represent the entire sensor data with the Bayer pattern. The following image shows you a crop of a CFA image. Note that the Bayer pattern (RGGB on this example) is visible.

Siril Bayer Pattern.png

Prochain sujet du tutoriel: Travail sur une séquence d'images converties.