Image data stretching utility.
SU INI name type unit [keywords]
SU MAKE name inlo inhi britlo brithi
SU LIST string
SU TABLE name
calibration type for the input table (default=any calibration type); to find the calibration type of an image, run IMGLIST FORM=ALL and see the value for type in the output
Use command SU to make the tables specified with keyword SU in the IMGDISP command. SU sets the tables to stretch raw, radiance, temperature, albedo or brightness values (depending on calibration) to a user-defined brightness value. Then you can use command EU to color the brightness ranges corresponding to the new values.
If you specify keyword RANGE, all input values less than or equal to min are assigned an output value of zero; all input values greater than or equal to max are assigned an output value of 255. Any additional breakpoints specified with the MAKE option that fall outside of min and max are assigned 0 or 255, accordingly. If you don't specify RANGE=, the stretches' slope previous to the first breakpoint is a continuation of the line formed by the first two breakpoints. Likewise, the slope following the last breakpoint is a continuation of the line formed by the last two breakpoints.
This entry lists all stretch tables saved on the workstation.
SU INI TIRORAD3 TIRO RAD BAND=3
This entry initializes table TIRORAD3 for use on the radiance values of TIROS band 3 images. Each new stretch table must be initialized.
SU MAKE TIRORAD3 0 1.2 20 220
This entry sets the breakpoint values in the above table TIRORAD3. Input 0 corresponds to output 20; input 1.2 corresponds to output 220.
SU TABLE TIRORAD3
This entry lists the breakpoints in table TIRORAD3 and information on BAND, calibration type and units.
SU INI MSATEMP1 MSAT TEMP BAND=1
This entry initializes the table MSATEMP1 to contain breakpoints in temperature for Meteosat band 1 data.
SU MAKE MSATEMP1 240 260 20 240
This entry stretches the temperature values from 240 to 260 in table MSATEMP1, over brightness values 20 to 240.
SU INI GENBRIT X BRIT RANGE=100 200
This entry initializes the table GENBRIT to be used on any calibration type with brightness units. The brightness values from 100 to 200 are stretched to brightness values 0 to 255. Brightness values entered with SU MAKE that are less than 100 or over 200 are assigned 0 or 255, respectively.
SU LIST GEN
This entry lists all the saved stretch tables that begin with GEN.