How to add pictures' dimensions below image title on lightbox?

[Stacys]

Could you please to help on this?? :
I use 'lightbox_notes_for_net' plugin and have this bigger size photo preview.
How to add pictures' dimensions below image title, as shown in the picture?

Gallery version 1.5.22
Theme: hardwired

Thank you very much in advance.

[Joe Carver]

It might be possible to replace the image caption.
Unfortunately, I have very little time at the moment.
I will check when some other changes are being looked at.