The BBC's Gabriel Gatehouse discusses one image of an emaciated man.
There is clear evidence that Syria has systematically tortured and executed about 11,000 detainees since the start of the uprising, a report by three former war crimes prosecutors says.
The investigators examined thousands of still images of dead prisoners reportedly smuggled out by a defector.
One of the authors told the BBC there was evidence of government involvement. Damascus has denied claims of abuse.
The report comes a day before peace talks are due to begin in Switzerland.
http://www.bbc.co.uk/news/world-middle-east-25822571