How to reverse colors of heatmap in Matlab's image()?

Question

Hi. I am using image() to show my two dimensional matrix as a heatmap, but the problem is that high values are showed in blue colors (cold ones). How to reverse the colors? Thank You for all replies.

Answer 1

From the first hit on Google: colormap(flipud(colormap))

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Or else you could just invert the image itself before showing it rather than the colourmap. I'm assuming either your data goes from 0 - 1 or from 0 - 255 so instead of

imshow(I) or imagesc(I) or ... image(I)? you can go imshow(1 - I) or imshow(255 - I)

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otherwise you could create a custom colormap.