[magick-users] 16 bits pgm file

[Anthony Thyssen]

"Mathieu Malaterre" on  wrote...
| Hello,
| 
|   I am having some issue with a 16bits pgm file. Are those steps
| supposed to work:
| 
| 
| $ wget http://samples.mplayerhq.hu/jpegls/test16.pgm
| $ identify test16.pgm
| test16.pgm PNM 256x256 PseudoClass 4096c 128kb
| $ convert test16.pgm test16.gray
| $ convert -depth 16 -size 256x256 test16.gray test16-2.pgm
| $ diff test16.pgm test16-2.pgm
| Binary files test16.pgm and test16-2.pgm differ
| $ md5sum test16.pgm test16-2.pgm
| 7a4c2d943148520d2f0da1882b2be204  test16.pgm
| 2da0da03b6eb03a7ecc401c0be70d639  test16-2.pgm
| $ identify test16-2.pgm
| test16-2.pgm PNM 256x256 PseudoClass 65536c 128kb
| 
| Technically I'd like to know what is the command line to produce a
| valid 16bits pgm file from a raw grayscale little endian 16bits file.
| 

Also the original pgm file is a 12bit depth.
IM will not save 12bit PGM files,  not at this time at least
I have put in a proposal for this to be fixed.

Then there is the matter of if it is a compressed (binary) or
uncompressed (text) PGM file.


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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   To err is human... to really foul up requires the root password.
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/