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        There exist a number of ways to get pixels into GREG2\.
  - Read the X, Y, Z values of a Z=f(X,Y) "image", use RGDATA (if  X  and  Y
    define  a  regularly  sampled  grid)  or  RANDOM (if X and Y are "random
    points") to make a Regular Grid Map (see HELP GREG1\COLUMN, GREG2\RGDATA
    and GREG2\RANDOM)
  - Read a RGDATA-format file with the RGDATA command (see topic RGDATA)
  - Define  a  2-D  SIC  variable  and fill it with values, or connect a SIC
    variable  with  an  existing  GILDAS  DATA  FORMAT  (GDF)   image   (see
    HELP SIC\DEFINE), or use the SIC\ACCEPT command to read formatted/unfor-
    matted streams of values and  put  them  in  a  SIC  2-D  variable  (see
    HELP SIC\ACCEPT).  Then  give  this  2-D  variable to the internal image
    buffer by the RGDATA Varname /VARIABLE command.
  - The command GREG3\IMAGE connects directly an existing 2, 3 or 4-D GILDAS
    DATA FORMAT image in the GREG image buffer. See HELP GREG3\IMAGE for de-
  - Use the VECTOR\RUN FITS_GILDAS command to convert a FITS image to a  GDF
    (Gildas Data Format) image that will be directly readable afterwards.
  - "on-the-fly"  automatic  conversion  from FITS to GDF format for SIC\DE-
    FINE IMAGE and GREG3\IMAGE commands.

Gildas manager 2014-07-01