The Collaborative International Dictionary of English v.0.48:

Solarize \So"lar*ize\, v. t. [imp. & p. p. Solarized; p. pr. &
   vb. n. Solarizing.] (Photog.)
   To injure by too long exposure to the light of the sun in the
   camera; to burn.
   [1913 Webster]