For now, the color image conversion gives you a 1.5M pixels image. It has been voluntarily limited, while we optimize our algorithms to get a better result in proper timing. Full resolution is available as an option.
To activate this option, before starting your observations: go to Profile > Gearwheel > Settings > Enable full resolution.
Stacking and recording will take a little longer but the size of the images will be doubled. Enabling this option is especially interesting for users who process their images on a computer or want to print their photos