Legacy ImageMagick Discussions Archive

I am trying to convert bmp to jpg (Red Hat Linux operating system)by:

convert 1234.bmp 1234.jpg

It seems converting, but the resulting 1234.jpg file is the same size as the 1234.bmp and when I do a diff on the files, there is no difference at all. It basically didn't convert to jpg, but just created another copy of the same file with extension jpg. I opened the 1234.jpg file in vi editor and the file header still shows it as BMP, not jpg.

Could anyone help me to convert to jpg?

Perhaps your version of ImageMagick does not include JPEG support. Type

• convert -list format

Look for the JPEG tag. Does it have a mode of rw-?

Thanks for the reply.

JPEG is not in the list when I list the formats. I checked the version I have and it is 6.4.6-6
What version has jpeg support?

All versions of ImageMagick have JPEG support if you have JPEG installed on your system including the headers. First install the JPEG and JPEG development RPMS. Next, rebuild and reinstall ImageMagick. Check the last few lines of the output from the configure script and verify JPEG has been validated. If not, check config.log to determine why the JPEG delegate library did not validate. Fix the problem and try the configure script again.

magick wrote:All versions of ImageMagick have JPEG support if you have JPEG installed on your system including the headers. First install the JPEG and JPEG development RPMS. Next, rebuild and reinstall ImageMagick. Check the last few lines of the output from the configure script and verify JPEG has been validated. If not, check config.log to determine why the JPEG delegate library did not validate. Fix the problem and try the configure script again.

Where can I find the JPEG RPM and JPEG develop RPM? I downloaded and installed the jpegsrc.v6b, is this the jpeg and jpeg development rpms? The config.log file says:

some lines from the config.log file
---------------------------------
jpeglib.h No such file or directory
canot find -ljpeg
ac_cv_header_jpeglib_h=no

The operating system is Red Hat enterprise linux 4.

What am I doing wrong?

Depending on your system you can install the JPEG development RPM like this:

• yum install jpeg-devel

or

• up2date jpeg-devel

If you build JPEG from the source distribution you need to install it, ensure there are no permission problems, and point the ImageMagick configure script to its location (e.g. /usr/local/). See http://www.imagemagick.org/script/advan ... lation.php.