This is the starting image:
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1.  Crop by holding down the right mouse button and dragging cursor to form rectangle.   When button is released, image will be cropped.  
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2 a.  Press X key. This will create 2nd layer with the same dimensions as the first and exchange it with the first layer.   This will appear black.
2 b.  Hold the Ctrl key down while clicking on Queue>Queue(1).   A dialog box will appear and you should enter "255,255,255" (white).  
2 c.  Hold down Ctrl key and click Basic>"Set Image to Color."   "Color" should appear as the last item on the menu bar.   Press F2 key and the image will become homogeneous white.
2 d.  As in 2b, enter color "0,0,0" (black).  
2 e.  Press P key and cursor will become circular.   (There is a bug under Windows ME and probably 98 and 95 that prevents the cursor display from changing.)   Enlarge cursor by holding down numeric keypad + key.  
2 f.  Place cursor at center of image and make black spot by pressing right mouse button.   (Paints the operation that was programmed into F2 in step 2c.)
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3.  Press P so than paint is off and then crop like this:
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4 a.  Press X to exchange layers.   The crop from step 1 should appear.   Write down the dimensions shown in the first pane of the status bar.  
4 b.  Press X again to show the spot.  
4 c.  Click Resize>Bilinear and enter the width and height from 4a and set Precedence to "Width and Height."  
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5.  We will want to blur the image in step 4, but this could take a long time for a large image.   It might be quicker to blur a small image and then enlarge the blurred image.   To this end, Click Resize>Lanczos and enter Horizontal Scale Factor = 0.25 and set Precedence to "Horizontal Scale."
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6.  Click Blur/Sharpen>"Fast 3x3 Average," and set Iterations = 100.   The following should be the result:
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7 a.  Enlarge as in 4c, except use Lanczos.  
7 b.  Click Basic>Negative.  
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8.  Press X to bring up first crop.   Click Basic>Negative.  
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9 a.  Click CSpace>log CMY.  
9 b.  Click Layer( On)>"Set F2/F3 to Add/Subract Layers."  
9 c.  Press F2 key.
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10 a.  Click CSpace>RGB.  
10 b.  Click Basic>Negative.   Finished!