'rgb2gray' undefined

[4evrplan]

I'm completely new to Octive (and MATLAB, FREEMAT, etc.).  Everything seems
to work, except that I get an error when I try to use rgb2gray:

octave:1> im1=imread('test.jpg');
warning: your version of GraphicsMagick limits images to 16 bits per pixel
octave:2> tmp1 = uint8(im1);
octave:3> tmp2 = rgb2gray(tmp1);
error: `rgb2gray' undefined near line 3 column 8
octave:3>

So, I tried FreeMat and got a similar error.  I'm using Octave3.6.1_gcc4.6.2
in Windows 7 64 bit.  I tried running it as an Admin, and it made no
difference.

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