[Magick-bugs] Possibile bug on identify command over 8bit Indexed TIFF file

[Amodio Alessandro]

Hi Duc,

this image comes out directly from a high quality book scanner.  
Probably this is due to a color downsampling operated by the software.

I tested the image with different applications and core engines  
(Photoshop, IrfanView, ThumbPlus, GraphicConverter, ExpressionMedia,  
ExifTool, Tiffinfo, etc.) and the depth is marked always 8.

Thank you,
A.


Il giorno 27/mag/09, alle ore 20:04, duc.sequere.aut.de.via.decede at imagemagick.org 
  ha scritto:

>
>>> 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%)
>