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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 format-
ted/unformatted 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 details.
FITS files can also be loaded in Greg:
- Use the VECTOR\FITS 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
- avoid disk-to-disk conversion by loading the FITS directly in memory
with the command SIC\DEFINE IMAGE.
See each command HELP for details.