Why do I get "illegal colormap error"

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Alex on 23 Mar 2015
I am trying to build a movie and I am using im2frame. I do not understand why it is telling me that my colormap is invalid. My data is double precision and I am trying to use colormap gray below is my simple code and error that I am getting. Please help!
for i=1:f
Error using im2frame
double-precision indexed CData values must be legal colormap indices: 1.0 <= value
<= length(colormap)

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