Want gray scale image of a matrix in matlab

[beman]

I am creating a gray-scale image of a 2000*2000 matrix using mat2gray and imshow command.But highest number of matrix entries that imshow can implement is 500*500 approximately.After that it shows------

"Warning: Image is too big to fit on screen; displaying at 8%
> In imuitools\private\initSize at 72
In imshow at 259 "

I know what is going on here but I want my all 2000*2000 matrix entries to be plotted in gray-scale. Is there any possible way?Please suggest some easy way because I am new in matlab.

 

[jedishrfu]

You could reduce your 2000x2000 to a 500x500 array by taking every fourth element or better yet average the elements in a 4x4 square to be the single element in the 500x500 image.

 

[beman]

No I want full resolution.Because for 500*500 case boundaries in image is not sharp enough for experimental purpose.

 

[JorisL]

If you can write the matrix to a file you can use gnuplot.
Not sure which functions you should/could use but it's possible. (I used it once for a simulation of the Ising model)

 

[jedishrfu]

Can you generate a png file from your data?

http://www.mathworks.com/help/matlab/ref/imwrite.html