Output Look Up Table Definition

Output Look Up Table Definition

Interactively define an output look up table colour scheme by drawing the Red Green and Blue colour components.

Define output LUT using which buffer ?

The output look up table will be constructed on the frame grabber monitor using the buffer specified here. In most cases buffer 0 will be desired as there is no need to save the image being produced.

Show intensity Scale or Buffer image in fourth quadrant ?

The buffer is divided into four quadrants. The top left shows the Red component, the top right the Green component and the bottom left the Blue component. The bottom right quadrant may be used to display either an intensity scale (<S>) or a half-size image copied from some buffer (<B>). This entry selects what is displayed in this fourth quadrant.

{If Buffer image in fourth quadrant}

Show which buffer in fourth quadrant ?

This prompt selects the source buffer for the image to be displayed in the fourth quadrant of the construction screen.

NOTE: To use the mouse you should switch to Full Screen by pressing <alt><enter>. When you have finished, <alt><enter> will restore the window.

Under Windows 95 the mouse only makes sense for DigImage when DigImage is running full screen. You may toggle between a window and full screen by pressing <alt><enter>

Use mouse and left button to draw component verses intensity or R Specify formula for Red component G Specify formula for Green component B Specify formula for Blue component S Set a specific colour value U Update colour scheme 

Q  QUit
->


   By holding down the left button of the mouse in one of the three drawing
   quadrants, the relationship between intensity P (horizontal coordinate
   from 0 to 255 in each quadrant) to colour component strength C (vertical
   coordinate from 0 to 255) may be drawn by moving the mouse pointer.


   If the left button is depressed while the mouse is in a given quadrant,
   then the drawing the the C-P relationship will be confined to that
   quadrant until the button is released. If the button is held down for any
   given (P,C), then this will replace the old value (P,Cold) for that value
   of P.


   The colours used to display the intensity bar or half-size image will only
   be updated when requested by pressing <U>. Note that intensity 0 will
   always be displayed as black and 255 as white during the construction or
   editting of the colour scheme. Once the colour scheme is completed, these
   will be set to the values specified by the drawing process.





{If S pressed}



Intensity for which output LUT value to be set ?


   Specify the intensity for which the output look up table entry is to be
   specified.





{If S pressed}



Strength of red component ?


   Enter the strength (intensity) of the red component of the output look up
   table.





{If S pressed}



Strength of green component ?


   Enter the strength (intensity) of the green component of the output look
   up table.





{If S pressed}



Strength of blue component ?


   Enter the strength (intensity) of the blue component of the output look up
   table.





{If R, G or B pressed}



Minimum intensity for formula ?


   This entry specifies the minimum intensity for the LUT entries to be
   modified.





{If R, G or B pressed}



Maximum intensity for formula ?


   This entry specifies the maximum intensity for the LUT entries to be
   modified.




Formula as a function of P


   Specify the formula to be used to calculate the colour component between
   the specified limits. The default value will give a linear interpolation
   between the current component level at the lower and upper limits of the
   range.




Save the output look up table to a file (Blank to suppress, .LUT default
extension) ?


   The output look up table may be saved by specifying a file name here. This
   table may subsequently be loaded using [;GOU User file].




Use this New look up table from now on or restore the Previous lookup table ?


  You can either continue to use the new output table that you have created
  or return to using the previous output LUT.





Errors, Warnings and Messages





Error Message:
Unable to retrieve current look up table


   I will be very surprised if you get this message, and would like to know
   if you do!







Parent menu 


Main Menu 


DigImage User Documentation 




Stuart Dalziel,
last page update: 19 February 1996