12-16-2017, 09:11 AM
(12-16-2017, 08:46 AM)rich2005 Wrote: Welcome to gimp-forum.net
Which version of linux are you using and which version of Gimp?
Thanks rich2005
version 2.8.16
Typically after puzzling over this for a while I happened upon the answer myself immediately after asking the question!
It seems to be that the x: marks the value of the point on the image where I click to open the curves dialogue. If I select curves from the colour drop-down menu the vertical line doesn't appear.