Methods and apparatus are provided for encoding a pixel domain image with hidden data by modifying the histogram of the pixel domain image to make space for such hidden data. More specifically, the present invention is directed to low toxicity carborane-containing 5, 10, 15, 20-tetraphenylporphyrin compounds and methods for their use particularly in boron neutron capture therapy and photodynamic therapy for the treatment of tumors of the brain, head and neck, and surrounding tissue. Furthermore, a method for manufacturing an uncut lens blank and an uncut lens blank are provided. The presence of oxygen in the charge trapping structure reduces the number of available dangling bonding sites, and thereby reduces the number of hydrogen inclusions in the structure. The key is also operable in a second mode e. anhydride residue represented by COC, and a polymeric unit derived from unsaturated dicarboxylic acid anhydride selected from maleic anhydride and itaconic anhydride; and an acid generating agent.