Solution
 
 
 
 

Program Steps:
 

1.  Ask user for the name of the input TIFF file
 
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2.  Ask user for height and width of image and store in variables: Image_Width, Image_Height
 
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3.  Set up the MIL system so that you can use the MIL display windows and other MIL routines as needed.  READ the following and also simply use the code provided.....you do not have to write this portion yourself....but, you should given the description below and the comments in the code and the MIL manual be able to understand each step.
See blue3.c prototype code or the following link.  Involves a number of MIL calls in the following order:
a)  Initialize ...telling MIL you are going to start using its routines and display information using MIL calls.
MappAllocDefault()
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b)  Next determine the size of the display that will be needed to show the image.
MdispInquire()
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c)  Allocate a MIL buffer for each image that you will be reading in or creating  (say call this MIL_buffer_I   and MIL_buffer_I_out  for our problem of two images).  This buffer is what will actually be displayed in a MIL program window.  Hence, for our case, we will need to do this twice.  Use the following MIL call:
MbufAllocColor()
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d) Clear each MIL buffer you created in c) so that it contains nothing at first.
MbufClear()
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e) OPTIONAL:  You can now, initially tie the MIL display to one of the MIL buffers...you will only see a black image as we cleared the buffer in step d).   We can make this ties using:
MdispSelect();
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f) Finally, in case hardward speedup via OverlayKeying exists you can turn it on to make things run faster.   This is done with the following MIL call:
MdispOverlayKey();
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4. Declare two unsigned char pointer, *I  and *Iout, where you will store the input image and the output image.
 
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5.  Allocate memory to the pointers using malloc().
 
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6.  Open up file and read data into I using MIL calls.
Hint: Use the two MIL calls:   MbufImport()  and MbufGetColor().   See manual or prototype code blue3.c given above.
 
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7.  Set up the MIL system to display this image.  This has been done already if you implemented Optional step 3 e).
Hint:  Use MdispSelect()
 
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8.  Visit each pixel in the image and convert the R,G,B values stored in I  to a single greyscale value and store it in Iout.
 
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9.  Dump the data in the array Iout into its MIL buffer  MIL_buffer_Iout  created in step  3c).  This is because MIL has its own datastructures for images for the purpose of displaying them and they are called MIL_buffers.   You can make this dump using the following MIL call:
MbufPutColor()
 
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10.  Display the contents of Iout.   First you must take the display and deselect any previous MIL buffer tied to it (either in step 3e or 7) using MdispDeselect()  and then use MdispSelect() to select the buffer MIL_buffer_Iout to be tied to it...so its values get displayed.
 
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11.  Ask the user when wants to terminate program.
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12.  Close down MIL system and deallocate any MIL buffers created in 3c.
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