dm2mrc(1)                                                            dm2mrc(1)



NAME
       dm2mrc - Create an MRC image stack from Digital Micrograph files.

SYNOPSIS
       dm2mrc [-d] <DM files...> <mrc image file>

DESCRIPTION
       dm2mrc will convert Digital Micrograph (DM) image files to an MRC
       stack, using raw2mrc.  The program should be able to convert version
       DM 2.5 files produced by DM 2.5 running on a Macintosh, DM 2.5 files
       exported by DM 3 running on a Windows PC, DM 3 files, and DM 4 files
       produced by GMS 2.x.

       The program will convert signed 16-bit integers, unsigned 16-bit inte-
       gers (by subtracting 32767), signed bytes (by adding 127), unsigned
       bytes, and 32-bit floating point numbers or integers (producing float-
       ing point output).  This default behavior can be modified by the
       options listed below, which is highly desirable with data from 16-bit
       cameras that have been stored as 32-bit numbers.

       The program will first scan through all of the files to determine the
       version of DM file, the data type, the image dimensions, and the header
       offset to the beginning of the data in the file.  If all of these
       attributes are the same, it will convert them in one call to
       raw2mrc.  Otherwise, it will convert each one independently into a
       temporary file, then make a stack from the temporary files with new-
       stack(1).  DM files that contain stacks of identically sized images
       will be handled; all of the images from each file will be included in
       the output file.

OPTIONS
       -s     Treat unsigned data as signed.  Use this option for unsigned
              16-bit data if the values are all less than 32768, or for
              unsigned 32-bit data being converted to 16-bit values with -c.

       -r     Reduce (divide) unsigned data by 2 instead of subtracting 32767.
              Use this option for data that are to be written as 16-bit values
              if the values range above 32767 and you prefer to lose one bit
              of precision to having negative numbers.

       -u     Store unsigned data in a 16-bit unsigned MRC file (mode 6, not a
              standard mode) instead of subtracting 32768.  These files may be
              less portable but should be usable within current versions of
              IMOD.

       -c     Convert 32-bit integers to 16-bit (short) integers instead of to
              floating point numbers.  If the data are signed integers, you
              can use this option alone if values are between -32768 and
              32767; or you can use the option with -r to divide by 2 if val-
              ues are between -65536 and 65535.  If the data are unsigned,
              then by default 32767 will be subtracted from the input values,
              so that values from 0 to 65534 can be stored as -32767 to 32767.
              Again, -r can be used to divide by 2 instead, so that values
              from 0 to 65534 can be stored as 0 to 32767.  If values in the
              input files are all less than 32768, then use the -s option to
              avoid subtracting 32767.


AUTHOR
       David Mastronarde

SEE ALSO
       raw2mrc(2), newstack(2)

BUGS
       The program has been written to handle common examples generated on a
       small subset of Digital Micrograph versions, so it might fail with
       files outside the range of this experience.  Email reports of problems
       to mast at colorado dot edu.



BL3DEMC                              4.5.6                           dm2mrc(1)