TImageType=(
              itUnknow=0,
              itBMP,          (* *.bmp, *.rle, *.dib *)
              itJpeg,         (* *.jpg , *.jpeg *)
              itCompuServe,   (* *.gif *)
              itPng,          (* *.png *)
              itTiff,         (* *.tif; *.tiff *)
              itGfi,          (* *.fax *)
              itSgi,          (* *.bw, *.rgb, *.rgba, *.sgi *)
              itAutodesk,     (* *.cel; *.pic *)
              itTruevision,   (* *.tga; *.vst; *.icb; *.vda; *.win *)
              itZSof,         (* *.pcx, *.pcc *)
              itWord,         (* *.scr *)
              itKodak,        (* *.pcd *)
              itPortable,     (* *.ppm, *.pgm, *.pbm *)
              itDr,           (* *.cut, *.pal *)
              itSGIWavefront, (* *.rla, *.rpf *)
              itPhotoshop,    (* *.psd, *.pdd *)
              itPaintshop,    (* *.psp *)
              itIcon 
             );//圖片類型