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copied!<p>The only way I am able to reproduce the error that you get is when <code>map</code> is a two-element vector where the first element is greater than the second. Note first that the function <a href="http://www.mathworks.com/access/helpdesk/help/toolbox/images/imshow.html" rel="nofollow noreferrer">IMSHOW</a> can be called with the following syntax:</p> <pre><code>imshow(I,[low high]); </code></pre> <p>In which <code>I</code> is a grayscale image and <code>low</code> and <code>high</code> specify the display range for the pixel intensities. The extra argument is ignored when <code>I</code> is an RGB image, but even then the value of <code>high</code> must be greater than the value of <code>low</code> or an error is thrown (the one you see above).</p> <p>What's confusing is why <code>map</code> would be a two-element vector. When loading an image with <a href="http://www.mathworks.com/access/helpdesk/help/techdoc/ref/imread.html" rel="nofollow noreferrer">IMREAD</a>, the <code>map</code> output will either be empty (if the image is not an indexed image) or it will be an N-by-3 color map. I can't think of a situation where the built-in <a href="http://www.mathworks.com/access/helpdesk/help/techdoc/ref/imread.html" rel="nofollow noreferrer">IMREAD</a> would return a <code>map</code> argument with just 2 elements.</p> <p>Based on the fact that you said it <em>was</em> working, and now suddenly isn't, I would suggest first checking to see if you have inadvertently created an m-file somewhere with the name <code>imread</code>. Doing so could cause that new <code>imread</code> function to be called instead of the built-in one, giving you different outputs than you expect.</p>

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