The Game Boy Camera has an analog output (a technical data sheet for the chip is available[1]), so the dithering is done in software. Although I am speculating,

The Game Boy Camera has an analog output (a technical data sheet for the chip is available[1]), so the dithering is done in software. Although I am speculating, at first glance it appears to be ordered dithering[2]. EDIT: I did find a document detailing the dithering algorithms and registers used for this purpose reverse-engineered here[3]. [1]: https://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/f2012/qs44_twc55/qs44_twc55/datasheets/MITSUB_image_sensor.pdf https://people.ece.cornell.edu/land/courses/ece4760/FinalPro... [2]: https://web.archive.org/web/20130512190753/http://white.stanford.edu:80/~brian/psy221/reader/Bayer.1973.pdf https://web.archive.org/web/20130512190753/http://white.stan... [3]: https://github.com/AntonioND/gbcam-rev-engineer/blob/master/doc/gb_camera_doc_v1_1_1.pdf https://github.com/AntonioND/gbcam-rev-engineer/blob/master/...