why the result of heatmap is not clear?

hi,

are ther any way to make the figure that result from heatmap more clear?

when I used heatmap to show the results of clustering , I get dim spots. can I get more clear spots?

thanks in advance

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers