convert of .tif with image inside the tiff compressed as tiff to jpeg-thumbnail doesn't work

Please help!

convert of .tif with image inside the tiff compressed as
tiff to
jpeg-thumbnail doesn't work:

The reult is a .small jpeg with all pixel white.

File Format of .tif compressed as jpeg inside is unusual but
legal.

Photoshop for example allows to store this format.

below command and versions:

linux:~ # convert -size 500x500 -thumbnail 250x250
-colorspace rgb
ve75_e02_008_QD2.tif dummy.jpg
convert: ve75_e02_008_QD2.tif: unknown field with tag 34665
(0x8769)
encountered. `TIFFReadDirectory'.
convert: Improper JPEG sampling factors 2,2
Apparently should be 1,1.. `JPEGPreDecode'.
convert: Cannot honour JPEG sampling factors that exceed
those specified..
`JPEGPreDecode'.
linux:~ # 
linux:~ # convert -version
Version: ImageMagick 6.3.1 12/14/06 Q16 http://www.imagemagick.org

Copyright: Copyright (C) 1999-2007 ImageMagick Studio LLC

linux:~ # uname -a
Linux linux 2.6.5-7.244-default #1 Mon Dec 12 18:32:25 UTC
2005 i686 i686
i386 GNU/Linux


libtiff in v.. 3.7.1-7.8
libjpeg in v. 6.2.0-738




MediaServiceProviding MSP
Michael Fischer

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