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[GREG2\]PLOT /SCALING Type [Low_cut High_cut]
Defines the type of transfer function to be used. Type can be LIN(EAR),
LOG(ARITHMIC) of EQU(ALIZATION), and the Low_cut and High_cut are the
lowest and highest represented values respectively. The default "cuts"
are the image extrema. The current cuts are stored in the variable array
CURIMA%SCALE. The current scaling (as an integer code) is stored in the
variable CURIMA%SCALING. The LOG transfer function computes the loga-
rithm of the pixels values, so does not like negative or null pixels.
The EQUalization scaling tries its best to put the same number of pix-
els in each slot of the color table, thus increasing immensely the visi-
bility of low-contrast images. This scaling mode has problem (and warns
user) when a large number of pixels have exactly the same value (i.e.,
no contrast at all). Beware that most "real" images are obtained with
receivers working with a small number (11 to 16) of bits, thus restrict-
ing the range of available Real numbers in the data.
The SIC variables CURIMA%EQUAL%NLEV, CURIMA%EQUAL%LEV and CURI-
MA%EQUAL%HIST contain the number of different levels computed in EQUAL-
IZATION mode, the values of these levels, and the number of pixels in
each level, respectively. Useful to know which contour levels to draw,
and necessary for the WEDGE command.