[Gimp-user] Circle selection with defined diameter size

[rich404 <forums gimpusers com>]

> Thank you very much , Does the 20 mm in the screenshot does it mean 20
> mm size of the vertical and horizontal diameter of the circle?

Yes, but real world units only come into play when printed at the resolution
specified. Are you  going to print something? Set up the canvas first.

Remember Gimp works in pixels (gets calculator out)

You can have 20 mm @ 300 ppi  (a print resolution) which gives 236 pixels

or 20 mm @ 72 ppi (typical screen resolution) = 57 pixels. 

A common beginners mistake is not checking the resolution when making a new
canvas.

-- 
rich404 (via www.gimpusers.com/forums)