5.8     Tasks
  This menu repeats many items from other menus, but
tries to group them by tasks they are useful for, rather than
by function.
  
5.8.1     Capture
  This menu groups operations which are useful in
capturing images, or for the initial processing you might
want to do to an image captured from another program.
    
- 
CSV Import 
- Import  an  image  from  a  CSV  file,  with  a
    few controls.
    
- 
Interpret Analyze 7 Header 
- Read   the   meta   fields   for
    volume  layout  and  calibration  from  the  Analyze
    header and reformat the image appropriately.
    
- 
Capture Video Frame 
- This   menu   item   will   currently
    only work on Linux machines with a compatible
    video4linux capture card. See §3.1.1 for notes on
    how it works.
    
- 
Smooth 
- Use  this  to  remove  texture  from  images.  It’s
    handy in conjunction with Flatfield.
    
- 
Flatfield 
- Use  this  to  correct  homogeneity.  Select  an
    image of a piece of white (or mid-grey) card, then
    select the image to correct, then click Flatfield. Use
    Smooth  to renmove texture from the white card if
    necessary.
    You can select a single white and a group of images
    to correct a large set in one step                          
- 
  White Balance  
- Use this to move the white point to make
          an area of the image you know to be white, white.
          Mark a region on an image, enclosing a patch you
          know to be white. Select the region and the image
          and click on White Balance.
          
- 
  Find Colour Calibration  
- Use  this  to  colour  calibrate  an
          image.  Drag  a  region  enclosing  an  image  of  a
          Macbeth Color Checker Chart and click Find Colour
           Calibration.
          
- 
  Apply Colour Calibration  
- Use this to apply the transform
          calculated by the previous item to another image.
          Select   the   calibration   object,   select   the   RGB
          image you want calibrated, and click Apply Colour
           Calibration.
          
      
5.8.2     Mosaic
  
  
    The items in this menu are discussed in appalling detail in
  Chapter 3.
          
- 
  One Point  
- Join   two   images   left-right   or   top-bottom
          with  a  simple  translation.  Mark  a  point  on  each
          image  to  be  joined  (open  image  view  window,
          Ctrl-left-click, drag to position), then click on the
          mosaic  button.  The  operation  performs  elaborate
          tie-point   adjustment,   so   your   selection   of   a
          common feature does not have to be exact.
          The  Manual  versions  do  not  perform  automatic
          tie-point correction and are useful when joing very
          difficult images.
           
- 
  Two Point  
- Do   a   join,   but   allow   the   right-hand   (or
          bottom) image to rotate and scale if it will improve
          the  match.  You  need  to  pick  two  points  on  each
          image.
          
- 
  Balance  
- Break  a  mosaic  apart,  examine  average  pixel
                                                                                       
                                                                                       
    value  in  the  overlap  regions,  adjust  brightness  to
    match, and reassemble. This only works for images
    which  have  been  produced  just  by  mosaic  joins!
    If  you’ve  done  anything  else  to  the  image  since
    loading it, the balance will fail with a mysterious
    message.
    
- 
Manual Balance 
- Adjust the brightness in a set of masked
    areas to match. Useful for removing shadows.
    
- 
Rebuild 
- Use this to mosaic up one set of files based on
    joins you made in another. Breaks a mosaic part to
    component files, performs a string substitution on
    the file names, and reassembles.
    
- 
Clone Area 
- Select over- or under-exposed pixels in one
    image  and  replace  them  with  the  corresponding
    pixels  from  another  image.  Useful  for  removing
    lead numbers used to identify X-ray plates.
    The function operates on two 8-bit mono images.
    Move  and  resize  the  region  on  the  first  image  to
    define  the  area  around  the  white  number.  Move
    the  region  on  the  second  to  overlapping  area.  A
    section of the area on the second image is cloned
    and  blended  into  the  first  image.  The  amount  of
    the defined area to be cloned in defined by a slider
    within the output image.
     
  
5.8.3     Picture Frame
  Items useful for mocking up painting frames.
  
5.8.4     Print
  Items useful while preparing an image for printing.
    
- 
Sharpen 
- Sharpen   an   image   for   printing.   This   is   a
    version of Filter  / Convolution  / Unsharp Mask  tuned
    for typical inkjet printers.                              
- 
  Adjust Tone Curve  
- Adjust the reproduction tone curve in
          LAB. Most useful for offset work, especially from
          transparencies.