Solarisation

Solarisation and Sabatier are techniques origionally used in the dark room. But through the years it became more popular in digital photography. Solarisation is an over exposure of a negative. It highlights the dark parts of the photo. Also it can take the opposite of an image. You can use black and white or color to do this technique. There is posative and negative solarisation. To do this you change the S curve of the photo to make a U or and upside down U.