grayscale images

[johnmb <johnmblackburn googlemail com>]

I thought this would be easy but I can't see a straight forward way to do it
on gtkmm.

I need to display grayscale images from an 8 bit monochrome buffer 1 byte
per pixel,  to a widget contained within a gtkmm Window.  Everything I have
seen so far seems to insist on an RGB map (3 bytes per pixel).  I am quite
happy to write to some form of image canvas repeating each byte 3 times into
each RGB pixel location but need some guidance as to the
widget/property/method for this.

Has anyone done this before or know how it could be done ?

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