McIDAS User's Guide
Version 2016.1

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EU

Enhancement utility.

Formats

EU COLORS
EU DEL name
EU LIST string
EU MAKE inlo inhi bcolor ecolor bframe eframe [keywords]
EU MAKE inlo inhi 1lo 1hi 2lo 2hi 3lo 3hi bframe eframe [keywords]
EU REST name bframe eframe [keywords]
EU SAVE name
EU TABLE name [keywords]

Parameters

COLORS

lists the predefined colors in the MCRGB.TXT data file for use in the bcolor and ecolor parameters

DEL

deletes a saved enhancement

LIST

lists the saved enhancements

MAKE

sets the enhancement

REST

restores a saved enhancement (default)

SAVE

saves the current enhancement

TABLE

lists the values of an enhancement

name

enhancement name; 512 alphanumeric characters maximum (REST option default=default grayscale enhancement; TABLE option default=current; no default for DEL and SAVE options)

string

lists only the enhancements beginning with this character string (no default; list all enhancements)

inlo

lowest brightness value of displayed image to apply the MAKE enhancement change to; the range is 0 to 255 (default=0); the resultant changes in color from inlo to inhi are done by interpolation from bcolor to ecolor or from 1lo, 2lo, 3lo to 1hi, 2hi, 3hi

inhi

highest brightness value of displayed image to apply the MAKE enhancement change to; the range is 0 to 255 (default=0)

bcolor

predefined color to apply to inlo; use EU COLORS to list the valid colors

ecolor

predefined color to apply to inhi (default=bcolor); use EU COLORS to list the valid colors

bframe

beginning image frame on which to apply the enhancement (default=current)

eframe

ending image frame on which to apply the enhancement (default=bframe)

1lo

intensity of the first color component to apply to inlo

1hi

intensity of the first color component to apply to inhi

2lo

intensity of the second color component to apply to inlo

2hi

intensity of the second color component to apply to inhi

3lo

intensity of the third color component to apply to inlo

3hi

intensity of the third color component to apply to inhi; the valid range for parameters 1lo, 1hi, 2lo, 2hi, 3lo and 3hi is 0 to 255 (default=0); the first color component is either blue or red, the second color component is green, the third color component is either red or blue; see the Remarks for more information

Keywords

FORm=

ALL

formats the TABLE option output to list each brightness level and its coresponding enhancement values on a separate line

 

STN

formats the TABLE option output to list sets of brightness levels and their coresponding enhancement values (default)

LOOP=

YES

applies the enhancement to all frames in the loop; overrides the bframe and eframe values

 

NO

does not apply the enhancement to all frames in the loop (default)

RGB=

YES

changes the order of the color components from the default (blue-green-red) to red-green-blue in the MAKE option's 1lo, 1hi, 2lo, 2hi, 3lo and 3hi input parameters and the TABLE option's output listing

 

NO

keeps the default order of the color components (default)

Remarks

Parameters 1lo, 2lo, 3lo and 1hi, 2hi, 3hi are the intensities (0-255) of the three color components that make up the final color applied to the inlo and inhi input brightness values. The RGB keyword determines the order in which the three color components are specified:

Brightness values are only listed with EU TAB when they vary from the default table, i.e., brightness values 0 to 255 have intensities 0 to 255 for blue, green and red. For example, EU MAKE 20 120 20 120 20 120 20 120 lists nothing because the blue, green and red intensities have not altered the default range.

Occasionally, a brightness range will contain a value that will not need to change as the new values are assigned by command EB. In the example below, the data's brightness value of 104 happens to match the value assigned during the EB stretch. Since value 104 did not need to change, it becomes a breakpoint in the EU TABLE listing and is not shown on the output below. Command EB 62 164 2 250 produces the following output from EU TABLE.

Brightness      Blue        Green        Red
 min  max     min  max    min  max     min  max
 ---  ---     ---  ---    ---  ---     ---  ---
  62  103       2  102      2  102       2  102 
 105  164     107  250    107  250     107  250

Multipanel frames (created with the PANEL command) use a single color table. So when you apply an enhancement to a frame (with the EU or EB command), the enhancement is applied to all panels on the frame. That is, you cannot have EU or EB apply one enhancement to one panel, and a different enhancement to another panel.

However, you can simulate different enhancements on each panel by displaying the image on each panel with its own set of brightness values. To do so, use the SU command to make the stretch tables, then display the images using IMGDISP with the SU= and PAN= keywords to select the appropriate stretch table for each image/panel. Then use EU to create separate enhancements specifically for each panel so that only its colors change when the enhancement is applied.

For example, if you have a four-panel frame you can make four SU tables, each stretching a different ranges of brightness values with commands like these:
SU INI PAN1; SU MAKE PAN1 0 255 0 63
SU INI PAN2; SU MAKE PAN2 0 255 64 127
SU INI PAN3; SU MAKE PAN3 0 255 128 191
SU INI PAN4; SU MAKE PAN4 0 255 192 255
Then display the imagery with commands like IMGDISP dataset PAN=1 SU=PAN1, IMGDISP dataset PAN=2 SU=PAN2, etc. You can then use EU to make an enhancement table for each of the images/panels. Enhancements for brightnesses 0-63 (e.g., EU MAKE 0 63 BLUE PURPLE) will apply to panel 1, enhancements for brightnesses 64-127 will apply to panel 2, enhancements for brightnesses 128-191 will apply to panel 3, and enhancements for brightnesses 192-255 will apply to panel 4.

See Also

Use command EB for interactive, mouse-controlled contrast stretching.

Examples

EU

This entry restores the default enhancement to the current frame.

EU LIST

This entry lists all the saved enhancement tables on the workstation.

EU LIST VAP

This entry lists all the saved enhancement tables beginning with VAP.

EU MAKE 20 75 255 255 0 0 255 255

This entry color enhances all image pixels with brightness values between 20 and 75 to solid magenta.

EU MAKE 100 200 RED YELLOW 1 3

This entry color enhances the image pixel brightness values between 100 and 200 on image frames 1 to 3 from red to yellow.

EU SAVE VAPOR

This entry saves the enhancement on the current frame to a file named VAPOR.

EU REST VAPOR LOOP=YES

This entry restores an enhancement called VAPOR to all frames defined in a loop.

EU TABLE

This entry lists the values of the current enhancement.

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