For some strange reason, I can't answer this question - it hangs everytime I try to post an answer, but just for this question, no others. So here's my answer:
See this code to turn off the warning:
warning('off', 'Images:initSize:adjustingMag');
When you say "i want to sort out this problem not to suppress", the only way to not have a warning (without suppressing the warning so that it does not appear in the command window) is to not display an image bigger than the screen. So you could subsample or use imresize() to create a smaller, temporary image. But that is totally unnecessary and time consuming , plus you'd just be doing explicitly yourself what imshow() does internally anyway . So the only sensible option is to suppress the warning, and I gave you code for that.
Best Answer