At astroGC we use free software for post processing of images. The camera is setup to save a RAW format of each picture. This produces extremely large files as it just save all the infomation from the camera chip. But this format alows to retouch the color balance, exposure and hundreed of more parameters. We do this treatment with RAWTHERAPEE, a free program under GNU licence. Afterwards, a last retouch can be performed with GIMP, also free / GNU licenced program. Thanks to both companies for developing such powerful softwares.

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