`convert in.dpx out.jpg` outputs a DPX file

[kensystem]

Using " ImageMagick 6.5.8-9 2010-01-08 Q16" the command:

convert in.dpx out.jpg

is outputting anther DPX files (according to first few bytes SDPX)

But in ImageMagick 6.3.5 09/20/07 Q16 that command works fine, generating a real JPG file...

Since the DPX files I'm testing with are not public domain I'm hesitant to post them, but I can say -verbose tell me this about the conversion:

in.dpx DPX 2048x1556 2048x1556+0+0 10-bit TrueColor DirectClass 12.75MB 0.180u 0:12.679
in.dpx=>out.jpg DPX 2048x1556 2048x1556+0+0 10-bit TrueColor DirectClass 12.75MB 0.150u 0:01.120

Does anyone know why this might happen?

Thanks,
Ken

[magick]

Chances are the JPEG development headers were not available when you compiled / built ImageMagick. Type

• identify -list format
  identify -list configure

Does it show that JPEG is supported in your release? JPEG should be listed like this:

• JPEG* JPEG rw- Joint Photographic Experts Group JFIF format (62)

Notice the rw-. That means that JPEG is supported for both read and write.

[kensystem]

Thank your for the fast response! Yes you are right, they are not listed. I wonder if it would be safer for the configure script to abort or require the user to pass an acknowledge arg, when commonly used codecs do not exist. That they should be expected/required libs, in other words.

Also if convert could print to stderr that it doesn't have output-support for the given file extension

Many thanks again for the fast response and powerful software.
Ken

[magick]

ImageMagick alerts you that a codec is not available when you run the configure script. Its in the last 40-50 lines of output. Ours reports that JPEG was validated:

ImageMagick is configured as follows. Please verify that this configuration
matches your expectations.

Code: Select all

Host system type: x86_64-unknown-linux-gnu
Build system type: x86_64-unknown-linux-gnu

                  Option                        Value
-------------------------------------------------------------------------------
Shared libraries  --enable-shared=yes           yes
Static libraries  --enable-static=yes           yes
Module support    --with-modules=no             no
GNU ld            --with-gnu-ld=yes             yes
Quantum depth     --with-quantum-depth=16       16
High Dynamic Range Imagery
                  --enable-hdri=no              no

Delegate Configuration:
BZLIB             --with-bzlib=yes              yes
Autotrace         --with-autotrace=no           no
DJVU              --with-djvu=yes               no
DPS               --with-dps=yes                no
FFTW              --with-fftw=yes               yes
FlashPIX          --with-fpx=yes                no
FontConfig        --with-fontconfig=yes         yes
FreeType          --with-freetype=yes           yes
GhostPCL          None                          pcl6 (unknown)
GhostXPS          None                          gxps (unknown)
Ghostscript       None                          gs (8.70)
Ghostscript fonts --with-gs-font-dir=default    /usr/share/fonts/default/Type1/
Ghostscript lib   --with-gslib=no               no
Graphviz          --with-gvc=yes                no
JBIG              --with-jbig=yes               no
JPEG v1           --with-jpeg=yes               yes
JPEG-2000         --with-jp2=yes                yes
LCMS              --with-lcms=yes               yes
LQR               --with-lqr=yes                no
Magick++          --with-magick-plus-plus=yes   yes
OpenEXR           --with-openexr=yes            yes
PERL              --with-perl=yes               /usr/bin/perl
PNG               --with-png=yes                yes
RSVG              --with-rsvg=yes               yes
TIFF              --with-tiff=yes               yes
Windows fonts     --with-windows-font-dir=      none
WMF               --with-wmf=yes                no
X11               --with-x=                     yes
XML               --with-xml=yes                yes
ZLIB              --with-zlib=yes               yes

X11 Configuration:
      X_CFLAGS        = 
      X_PRE_LIBS      = -lSM -lICE
      X_LIBS          = 
      X_EXTRA_LIBS    = 

Options used to compile and link:
  PREFIX          = /usr/local
  EXEC-PREFIX     = /usr/local
  VERSION         = 6.5.9
  CC              = gcc -std=gnu99
  CFLAGS          = -I/usr/include/OpenEXR -fopenmp -g -O2 -Wall -W -pthread
  CPPFLAGS        = -I/usr/local/include/ImageMagick
  PCFLAGS         = -fopenmp
  DEFS            = -DHAVE_CONFIG_H
  LDFLAGS         = 
  MAGICK_LDFLAGS  = -L/usr/local/lib 
  LIBS            = -lMagickCore -llcms -ltiff -lfreetype -ljasper -ljpeg -lpng -lfftw3 -lfontconfig -lXext -lXt -lSM -lICE -lX11 -lbz2 -lIlmImf -lImath -lHalf -lIex -lIlmThread -pthread -lrsvg-2 -lgdk_pixbuf-2.0 -lcairo -lgobject-2.0 -lgmodule-2.0 -lrt -lglib-2.0 -lxml2 -lz -lm -lgomp -lpthread 
  CXX             = g++
  CXXFLAGS        = -g -O2 -Wall -W -pthread

[kensystem]

Got it. Could convert at least write a warning/error to stderr when a format cant be supported? That would help those of us who might otherwise expect JPG to be a required lib in configure. Otherwise users spend hours (I did) trying to figure this out, and having this conversation