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prewitt is one of the well known edge detection filters .it is similar to sobel.It is a first derivative filter.here is a MATLAB example :

Code:

    clc
;
   
    
%% create a new figure to show the image . 
    newImg 
= imread('Water lilies.jpg');
    figure(1);
    %% convert RGB to gray scale.
    grayImage= rgb2gray(newImg)
    imshow(grayImage);
    figure(2);
    %% apply prewitt filter.
    afterFilter = edge(grayImage,'prewitt')
    imshow(afterFilter);
 





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