OK Rob, it works as expected!
I had red and green as FG/BG and this is the result:

Sorry for bringing up old message, but I was wondering if anyone still uses this script for 2.8?

Hello everyone.
I´m a new gimp user and i think this plugin will work awesome for me but i can´t find it anywhere to download.
Could please someone give me a download link?
thanks in advance

I was able to find it. Quick question. Would it be possible to fill the shapes within black lines and then after delete those black lines while keeping the fill together?
Don´t know how to explain it correctly, i´m looking for a way to erase the black line and don´t leave any blank space within the filled shapes.
Thanks in advance

regido
I'm not in the best position to answer you as level_0 but I think now this script is no longer needed since the release of Gimp 2.10.10 and filling by line detection
https://www.youtube.com/watch?v=c6Cpj99Yp9A

I still use this often. It's fun for coloring pages etc. especially with custom palettes, and it can create a version without black lines.
Attached version of script that works in 2.10. Menu entry: Filters/Flatting.
Make sure you have "flatten after" enabled, then you will end up with the original layer on top, and a flattened colored without the black lines on bottom. And 0,0 at ignore and flag areas, so that even the smallest areas are filled with the palette color.
It's pretty slow if your image is big and includes lots of areas to fill.

Thank you Nidhogg for these clarifications and the script.
It's amazing to see a 2011 script still running in 2019.
I will have fun with it.

Edit:
finally I am not very seduced by this filter and I prefer to use the current Gimp filling tool.

Thanks for your replies. I´m gonna try it.

When i fill with colors there are no problems, but when i try to fill with patterns or gradients i´m getthing this.
MultiFill Warning
Endless loop detected - flatting failed. Please uncheck 'Flatten After' and try again.

DO you have any idea on what could be the cause of this problem?
Thank you

Yes, i tried that.
I tried with different images and i´m getting different errors, even changing the image resolution to under 1000px

Error while executing script_fu_MultiFill:

Error: vector-ref: out of bounds: 10

And this other error

Plug-in 'MultiFill' left image undo in inconsistent state, closing open undo groups.

Thanks in advance

I found this script very interesting, but unfortunately only the Randon Colors option works.
Other options, with Palette, Gradient or Pattern do not work generating errors.

Using Samj Portable 2.10.12 on Win10

I´m getting the same errors.
Do you think it´s because of the gimp version?

So anybody have any idea on what version of gimp this script can work with? i would download that version.
Thanks in advance

I have my personal "filling" small python script.
So, you may try this simpler one (no warranty to get what you like...).
Was prepared for 2.8, but I modified it to work now on 2.10.

Examples of outcomes:

Hi @dinasset, I tested DIEGO_RENDER_Filling using the portable from
Samj 2.10.12 on win / 64.

This version, unlike the one downloaded by the Nidhogg link at # 106, does not generate any error windows. But it does not work as expected.

I used the original image on the bottom and selected layer. And I created a transparent layer put on top.

For randon colors, randon palettes and randon gradients, the result is the entire original image 100% filled with the color chosen from the "Color to replace residual areas" menu.

Thank you for your willingness to help!

Simply DO NOT ADD a transparent layer on top, launch it with the original layer only, it works on it (and generates a new image if you set "work on copy" TRUE)

I wish it were as simple as that, but in fact I had tried without adding a transparent layer to the top, and nothing changed the result.

►Adding a layer, generates a new image with the original image in the botton layer and another layer (top) with the change produced.
►Without adding a layer, it generates a new image with only the layer showing the change.

►►But ... in both cases, the result is the same, the color chosen for the residual areas is displayed.

In the Nidhoog version, only the color fill works ok, trying to get palette or gradient results produces erroneous messages.

I tried the older version of Graechan, and to my surprise was where I got the best results. But I couldn't control which gradient generates the result, since even setting a gradient results are always random.

Below results with Graechan's FlattingTools.scm.
From left to right - Colors - Palette - Gradient

PS: Image has transparency, represented here visually by the white part.