> > t seams not able to recognized the exact 8bit color-depth.

The problem appears to be the colormap.  The colormap indexes are stored with
8 bits because there are 256 entries in the colormap.  However, the colormap
RGB values exceed 8-bits.  Some examples:

      245: (62720,62720,62720) #F500F500F500 rgb(95.7046%,95.7046%,95.7046%)
       246: (62976,62976,62976) #F600F600F600 rgb(96.0952%,96.0952%,96.0952%)
       247: (63232,63232,63232) #F700F700F700 rgb(96.4858%,96.4858%,96.4858%)
       248: (63488,63488,63488) #F800F800F800 rgb(96.8765%,96.8765%,96.8765%)
       249: (63744,63744,63744) #F900F900F900 rgb(97.2671%,97.2671%,97.2671%)
       250: (64000,64000,64000) #FA00FA00FA00 rgb(97.6577%,97.6577%,97.6577%)
       251: (64256,64256,64256) #FB00FB00FB00 rgb(98.0484%,98.0484%,98.0484%)
       252: (64512,64512,64512) #FC00FC00FC00 rgb(98.439%,98.439%,98.439%)
       253: (64768,64768,64768) #FD00FD00FD00 rgb(98.8296%,98.8296%,98.8296%)
       254: (65024,65024,65024) #FE00FE00FE00 rgb(99.2203%,99.2203%,99.2203%)
       255: (65280,65280,65280) #FF00FF00FF00 rgb(99.6109%,99.6109%,99.6109%)

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