[Image-SIG] TIFF16 greyscale to color image

[Stephane Henry]

Hi,
 Could someone point me an efficient way to transform 16 bits
greyscale tiffimage to a color image; or more simply how to create a
color image from an array of value with the possibility to choose the
palette, like the function imshow from Matplotlib.
Can this be done with using either the function ImageOps.colorize, or putpixel?
Thanks
Stephane