white contour on top of grayscale image

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Richard
Richard le 12 Sep 2012
Is there a method for changing the colorscale of your figure to grayscale without using the colormap('gray') option. I have an image which I want to publish in grayscale but I want to add a white contour plot on top of the image, by changing the image to grayscale it also changes the color of the contour to black, which I originally specified as white. Is there a method for working around this?

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Walter Roberson
Walter Roberson le 12 Sep 2012
See the MATLAB File Exchange contribution "freezeColors"

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Image Analyst
Image Analyst le 12 Sep 2012
Did you try converting your image to grayscale using rgb2gray()? And then use export_fig() to save your image, after you've put contours or other graphics and annotation atop of it?

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