rgbImage = MonoImageToSRGB(monoImage,xy,[SCALE])
Take a single plane image in and convert to an sRGB standard
color image out. The chromaticity of the output image will
be at the specify CIE x,y chromaticity value.
Result is a uint8 image scaled into range [0,255].
The value of SCALE is passed on to SRGBGammaCorrect, and
there determines whether autoscaling is applied to the image.
6/15/11 dhb, ms Wrote it.