Re: [Jpeg-users] problem with pvrg-jpeg

[Mathieu M. <mat...@gm...>]

hi Kurt,

  WARNING: I am not advicing you to use pvrg-jpeg by any mean. You
should keep in mind that the lossless encoder of PVRG is sk*ew up (I
really mean it). The only reason why I worked on this package was to
be able to handle PVRG' compressed file. The only way I found out was
to decompress them with pvrg and then recompress them with
IJG+lossless patch. See GDCM (http://gdcm.sf.net) for the complete
solution.

  Anyway the command line you are looking for is:

$  convert test.pgm test.gray
$  pvrg-jpeg -iw 1024 -ih 64 test.gray -s out.jpg

Assuming that your test.pgm would start with something like:

P5
1024 64
255
...

I have not tested with RGB, but it should work. convert is from the
imagemagick package.

HTH

On Fri, Feb 19, 2010 at 11:52 AM, Kurt Horvath <ku...@ko...> wrote:
> Hallo!
>
> I want to use pvrg-jpeg on debian to compress lossless medical data but it
> seems I have got an input problem. My original source is .bmp (bitmap
> 8-bit). But I also did try to convert to pgm as mentioned in the manual
>
>
>
> I was thinking about following command:
>
>
>
>  pvrg-jpeg –iw 320 –ih 240 –hf 2 –k 21.pgm –s myfle1.llj
>
>
>
> can u give me a hint where my mistake is? (error is 2092: Invalid input
> detected)
>
>
>
> (P.S.: I really need lossless jpeg because I am doing compression of several
> standards)
>
>
>
> Regards,
>
>
>
> Kurt Horvath



-- 
Mathieu