0 Replies Latest reply on Jul 15, 2017 6:18 PM by MadMax77

    Locked Dup Post: Photograph or pencil drawing

    MadMax77

      Hello,

      [Excuse me for the mistakes, as a non-native speaker]

      I would like to know if a picture is real (even with filters) or entirely drawn. Nowadays with modern tools we can easily draw a complex picture starting from pixel number one and use sophisticated algorithms to continue the drawing. And in a near future it might be beyond our natural skills to know whether or not a picture is real (even a video or a game),

      I've read about the error level analysis (ELA) which is looking into the different levels of compression artifacts. It has shown some interesting results but is also said to be a non objective tool for this use and has some limits (impossible to use with PNG...),

      I've also read about the pixel counting, thus to look for abnormal, unnatural, breaks in the range of colors used,

       

      Also about filtering a picture black and white, setting high contrast and counting on the one hand the white pixels and on the other the grey/black ones to get a ratio,

       

       

      Is there relevant methods regulary used in the first steps of this kind of analysis,

       

       

      Thank you