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Problem plotting matrix with image

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Hi, i'm trying to plot a file into a 2D image. The file is setup in a 43X43 matrix that has to stay in that format. It's plotting the image but, i want to change a specific value from my matrix to plot a specific color instead of following the color palette that i have setup. 

This currently is my code and i'm not sure how to specify a color outside of the color palette for a given value in the data file.

set terminal postscript landscape color enhanced colortext  font 'Palatino-Roman, 16' 
unset title
set border linewidth 0
unset xtics
unset ytics
unset key
set colorbox
set cbrange[-8.30470026E-02: 1.23593502E-01]
set palette defined (0.0 '#000090',\
   12.5 '#000fff',\
   25.0 '#0090ff',\
   37.5 '#0fffee',\
   50.0 '#90ff70',\
   62.5 '#ffee00',\
   75.0 '#ff7000',\
   87.5 '#ee0000',\
   100  '#7f0000',\
   102  'white') 
set output '6.ps'
set size ratio    0.71667
set xrange [-0.5: 59.5]
set yrange [-0.5: 42.5]
plot '6.dat' matrix with image

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Problem plotting matrix with image spy_c@hotmail.com - 2014-08-04 11:57 -0700

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