Legacy ImageMagick Discussions Archive

Hi,

I am running imagemagick 6.8.3-5 on an solaris11 machine.

# convert --version
Version: ImageMagick 6.8.3-5 2013-08-21 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2013 ImageMagick Studio LLC
Features: DPC Modules
Delegates: bzlib fftw freetype jng jpeg lcms lzma openexr pango png ps tiff x xml zlib

The problem is, I am not able to convert pdf into tiff with jpeg compression. Is this a limitation of imagemagick or am I doing something wrong here?

# convert mozilla.pdf -compress JPEG mozilla2.tiff
convert: BitsPerSample 16 not allowed for JPEG. `JPEGSetupEncode' @ error/tiff.c/TIFFErrors/562.

I was able convert from jpg to tiff using jpeg conversion though. Could someone help me out here, please? Am I missing something here??

Thanks in Advance!
gmr

It appears that you cannot compress 16-bit data with jpg compression. Looks like libtiff does not allow that.

try

convert mozilla.pdf -depth 8 -compress JPEG mozilla2.tiff

Thanks for the tip. I also found similar posts on web. I tried the following. But I am still not able convert it successfully.

$ convert testsample2.pdf -compress JPEG testsample2.tiff
convert: BitsPerSample 16 not allowed for JPEG. `JPEGSetupEncode' @ error/tiff.c/TIFFErrors/562.
$ convert testsample2.pdf -depth 8 -compress JPEG testsample2.tiff
convert: Bogus input colorspace. `JPEGLib' @ error/tiff.c/TIFFErrors/562.
$ identify -verbose testsample2.pdf | grep 'Colorspace'
Colorspace: sRGB
Colorspace: sRGB
Colorspace: sRGB
Colorspace: sRGB
$ convert testsample2.pdf -depth 8 -colorspace sRGB -compress JPEG testsample2.tiff
convert: Bogus input colorspace. `JPEGLib' @ error/tiff.c/TIFFErrors/562.
$

Any suggestions how to tackle the latest error?

Thanks in advance!
gmr

Try upgrading your release of ImageMagick and libTIFF. Converting from PDF to TIFF worked without complaint for us with ImageMagick 6.8.8-1 and LIBTIFF, Version 4.0.3.

I am running 6.8.3-5.

$ convert -version
Version: ImageMagick 6.8.3-5 2013-08-21 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2013 ImageMagick Studio LLC
Features: DPC Modules
Delegates: bzlib fftw freetype jng jpeg lcms lzma openexr pango png ps tiff x xml zlib
$

Does that mean, the version that I am using doesn't support the attempted conversion?

Thanks!
gmr.

I am running libtiff-3.9.5.

I am just trying to understand whether this issue is due to wrong conversion specifiers or the limitation of imagemagick itself.

Thanks!
gmr

According to http://en.wikipedia.org/wiki/JPEG there is a 12-bit JPEG format, "but this format is not as widely supported."

Current IM (v6.8.8-0) silently converts 16-bit/channel images to 8-bit. Eg: identify -verbose shows the result is 8-bit.