Why do I see an all white image when I use IMFILTER?

i have chessboard image and i'm apply ones(31) filter for this image by using imfilter but the result is white image . can you help me to solve this error

this code used

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g = imread('ch2.jpg');
h= rgb2gray(g);
w=ones(31);
gd=imfilter(h,w); 
imshow(gd,[]) ;

[Image Analyst]

You forgot to attach your image ch2.jpg. Please attach it using the paperclip icon.

Answer 1

[Premnath]

I am unsure what you are trying to achieve. If you are using w=ones(31) as averaging filter. Then change your code as below

g = imread('ch2.jpg'); 
h= rgb2gray(g); 
w=fspecial('average',31); 
gd=imfilter(h,w); 
imshow(gd) ;

Answer 2

[Image Analyst]

Cast h to double and it will work:

h = double(rgb2gray(g));

[Image Analyst]

Please mark as Accepted if it worked for you. Thanks.