How do I create a perfect curve transform

[gib65]

Hello,

A while back, I created this front cover for a book:



I'm trying to remember how I transformed the second half of the title: "Great Planetary Odyssey". It was straight at first (like the first part of the title: "Captain Gabriel") but then I curved it. I'm wondering how to reproduce the same effect on a different title. I tried doing it with the cage transform tool but I can't get it to look smooth with a perfect curve. Is there any other way to have this effect besides the cage transform tool?

[PixLab]

Cage transform I would recommend to never use this Tool... for anything!

In your case
Filters ➤ Distorts ➤ Curve Bend...
It seems that you did used the Lower option only... which is the bottom of the text/image to curve (to amplify the effect, do a Layer ➤ Crop to content before opening the Curve Bend)
Add as many nodes as you need and move/drag them to smooth the curve

   

Result (after applying the effect your layer might be somewhere partially hidden, just use the move tool to bring it back where you want)
   

More ➤ https://docs.gimp.org/2.10/en/plug-in-curve-bend.html

[gib65]

That's great, PixLab! That did the trick nicely.