Les séquences d'images SER
Le format de fichier SER est un format simple de séquence d'images, similaire à des films non comprimés. De la documentation peut être trouvée sur la page officielle. La dernière documentation PDF a aussi été copiée sur free-astro.
Désormais, SER peut gérer des images en couleur, ce qui en fait un remplacement idéal aux AVI ou aux autres formats de vidéos utilisées par des logiciels de capture désuets, pour tous les cas d'usages d'images en astronomie amateur.
The main issue with AVI and other film containers is that it is designed to work with many codecs and pixel formats, which it good for general purpose films, but requires astronomy software to handle a large array of actually different file formats. General purpose film software are often not well equipped to handle 16-bit per pixel values or some uncompressed data formats. With SER, only one file format handles it all, that's why Siril for example is now developing processing only for SER.
File structure
A SER file has three parts:
- a 178-byte header containing images and observation information
- image data, raw pixel data
- an optional trailer containing dates for all images of the sequence
Handling colours
In version 3 (2014), there are two ways of handling coloured images in SER. If data comes directly from a sensor, the preferred way is probably to use one-plane images and interpolating data from the colour filter array (similarly to CFA file formats used in astronomy software).
The other way, added in version 3, is to use three planes to represent RGB image data. SER v3 supports RGB/BGR 8/16-bit data. This can be useful if data is converted from a source with an unknown colour filter array or for general purpose conversion.