This is more fun than custom font (at least I think so).

You can use this script to slap any image on top of a railing definition file (works similarly to custom font file where you can define your own railing definition .xcf file).

I have created a railing definition file as example and here i just ran script to slap image of buddha statue on the railing definition file...and this is what you get.


More details here-> Custom railing script for GIMP

Version 2 of script uses first 3 points of defined paths (point 4 is calculated based on first 3 points) produces better aligned railings.

That looks like a lot of fun. How does a railing definition file work?

it IS a lot of fun...
here's how the railing definition file is created: How to create custom railing definition file
I wrote this for version 1 of script. For version 2, you can define 4 points it just won't use the 4 th point and calculate it from the first 3 points (of each railing) and creates much more aligned result.

Just tested in GIMP 2.10 (Ubuntu flatpak installation).
Success.

Finally I found this one again. Just don't remember how it works!

Thanks for the plug-in.
Jappaloe63, too.
I don't remeber how it works. Tin, can you help? Thanks in advance.

Could someone tell me how this works?

I haven't seen this one before so don't have Tim's instructions, but from reading the code:

Menu: Python-Fu -> Custom Railing

Run the plugin on the layer containing the picture you want to put on the railings.

In the plugin dialog box, you need to give it:

".xcf railing file:"

Enter the .xcf image that is your railings file, the plugin will load this image.
This is a second image that defines the railings.
The plugin will use the active layer from this image which should be a picture of railings.
The image also needs to contain paths that define where the railings are.
If you don't have Tim's example .xcf railings file you will need to find your own railings picture and make the paths by hand.
It only uses the first stroke in the path so you need to make one path for each rail.
It uses specific anchors of a path:
1st anchor: Top left corner of one rail.
2nd anchor: Top right corner of the rail.
3rd anchor: Bottom right corner of the rail.
4th anchor: You can skip this if you have chosen "Use 3 Points instead of 4 (Calculate 4th points):" Otherwise it should be the bottom left corner.

"Use 3 Points instead of 4 (Calculate 4th points):" is explained above.

What the plugin does:

Makes a new image and puts the railings picture onto the new image.
Copies a slice from your picture to the new image.
Transforms the perspective of the slice to match a rail as defined by an above path.
Repeats the copy slice and transform for each of the other rails.

PS: Forgot to say the paths should be the order: From top of the paths dialog down should be rails from right to left.

Thank you for your explanation ... Go see if it will work