RGB encoding for JPEG Compressed TIFF in GraphicsMagick 1.3.21

Is there a parameter for the "convert" utility that allows reverting to 
RGB encoding when JPEG compression is requested for an RGB image?  If 
there is no parameter for the command line or OLE, an option for Python 
or C would be helpful.

Behavior Changes:
TIFF: Now uses YCbCr encoding when JPEG compression is requested for an 
RGB image.

http://www.graphicsmagick.org/NEWS.html#february-28-2015

Thanks.

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