Up: GREG3 Language Internal Help
[GREG3\]IMAGE [Filename] [/PLANE I1 I2] [/SUBSET Imin Imax Jmin
Jmax] [/WRITE] [/CLOSE]
Associated "G_*" variables are defined after the first call to the IM-
AGE, SPECTRUM or KILL commands of GREG3\ language.
Read the GDF map Filename. The default image extension is .gdf. This
command defines the image found in given file as the new current image.
Projection, system and extremas are also defined if needed. Unless op-
tions are present, the first plane of the image becomes the new Regular
Grid array in GreG.
The /PLANE I1 I2 option allows to define part of a more than 2-Dimen-
sional image as the regular grid array. A file name should not be speci-
fied if you want to select a new plane in the current image.
The /SUBSET Imin Imax Jmin Jmax option allows to load only a subset of
the input image or image plane. Again, a file name should be specified
only to change the input image. You can combine /PLANE and /SUBSET op-
At open time, the /WRITE option allows you to map the image writeable
(instead of Readonly by default), a prerequisite to use some functions
(e.g. KILL which kills pixels).
The /CLOSE option allows you to close the currently opened file, and to
free associated memory, if any.
Without option nor argument, the header of the image currently in memory
is listed, if any.