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A black and white filter for Matlab figures

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Theo on 18 Apr 2013
Creating grayscale images from Matlab figures can be a big pain because you have to scale your colormaps and color limits just right so that the gray colormap picks up all the details. I've realized that Photoshop is very, very good for doing this. You load in an image and use the black and white filter, and then change the levels of reds, greens, blues, etc.
I think it would be extremely useful to have a function that one can call that takes in the same inputs as Photoshop requires. This function might be of the form
function bwfilter(h, C)
where C is a matrix that takes in the input of red, green, cyan, etc. percentages, and h is a figure handle. Upon running the function, the figure is converted to black and white and either kept as Matlab's .fig format, or if not possible, exported as a png, pdf, etc. perhaps using the excellent export_fig function by Oliver Woodford.
I'm not sure how to go about this. Can someone advise? Of course, if anybody wants to step to the challenge...

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