I'll be using the attached image for the background of the cover for the next novel I'm indie publishing. I want to switch the colors so the white infill areas are a certain shade of red, the dark timbers are shades of pinkish white, and the windows are something in between--- not all the same color, but a range reflecting the highlights and shadows of the original picture.

   

I've learned that Colors ---> Maps ---> Color Exchange might work for me. I've figured out that I can't select the From Color until I've turned off the alpha channel on the image. 

But when I select the From Color, choose the To Color, and click OK, nothing happens. The photo doesn't change, even though the Edit menu gives me the option to undo the Color Exchange.

I prefer to work on my older ThinkPad touchscreen laptop where I run GIMP 2.8 on Windows 7. I also have a Windows 10 PC with GIMP 3.04. As another test, I used it to try Color Exchange on this Fachwerk photo. But again, when I click OK, I see no change. And again, the Edit menu tells me the exchange was made.

It's the same with other images I've tried.

Given all this, I have two questions:

1. Is Color Exchange the best way to do what I want here?

2. If it is, what am I failing to do, that I can't see any change in 2.8 or in 3.04? Is there another step I need to take to complete the process?

Thanks in advance.

Hi guys,

I am trying create a similar effect on my predator image (the first image) as it is in the photograph from the movie (the second image), where there are link blue sparks of electricity. I know it looks very different at the moment, but I am trying to make it look more realistic. At the moment the blue sparks on the first image looks like it is just pasted over the top of predator, as opposed to making it look like it is actually on his body.

Do you guys know what technique I could use to make it look like the blue sparks are actually on his body?

Many thanks.

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We want to install Gimp at our office. 

But we are looking for a way to block the installation of plug-ins by our users.

The objective being that the IT Dept, will verify the plugins and the security risks of them before deploying to each user.

I haven't seen a way to block the installation of plugins by users. Espacially since they can always go and say it's in this or that folder (so finding one they have rights to).

Thanks,

Hello
I asked Gemini GPT about how to replicate a colour chemical photobooth look in GIMP. Gemini explained the photobooth history, different lenses and chemical approaches and eventually wrote me a python script that creates the look.
Of course, the python script looks the part to an neophyte such as myself, but does not work either in python3 or Gimp python or as a filter. It does not show in GEGL either.
(I have yet to get a GPT sourced python script that works off the bat, so dev still have a career in front of them).
The funny thing is, the every time I ask the GPT to correct the script, it finds an "error" to correct, but none of these corrections ever make the code work.
The primary issue is that when I run the script in fu-script, I get loads of indentation error! Python indentation drives me crazy.
Therefore ... Does anyone know if there is a working "photobooth" GIMP script?
Can anyone help me debug this script for GIMP 3 linux  please ?

I'm making a paint scheme for a computer game called Nascar Racing 2003 Season, and used a template online to make one. I stopped in the middle of creating it to test it in-game, but when I export it and view it, for some reason, only the top left parts of the image seem to have been exported. Everything else in the image is transparent. I first tried exporting in .tga (since thats the file type needed for the game to accept it), then tried in .png, but that also showed the same results.

What shows in GIMP
   

What shows after exporting
   

What the .tga looks like in GIMP
   

Google Drive link to my .xcf
https://drive.google.com/file/d/1qP6bZMS...sp=sharing


Google Drive link to the template used
https://drive.google.com/file/d/1CiKuBV3...sp=sharing

This is the first time I've had a problem with GIMP bugging out with exporting like this. Any help would be appreciated!!!

Hello,
I'm a complete noob when it comes to programming and stuff like that, so I need your help...

Here's the problem: I have a picture with 4 irisses (as in example). I want to attach effects like dissolve in sand und crash-effects with lightning. I guess, I nedd some plugins to do this und to vary the parameters for the effects.

Are there some effects / plugins, I can use and / or download for this? I already tried it with the of ChatGPT & Co, but all in all it didn't work.

Thanks in advance for your help!
fritscho

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I am attempting to use the Layer facility. 
I am using the relevant examples in the manual under Chapter 8 of the manual, specifically Figs. 8.2 to 8.4.
The attachment shows my attempt on the lhs to emulate the manual - but I don't get the same results.
Any suggestions?

I can't seem to find a way to use the eraser tool just to erase brush strokes. I can only seem to get the eraser tool to act upon the entire image, erasing to the background, instead of erasing only the paintbrush strokes.

I will better explain with a simple example. Say I have a simple single layer file with a photograph of a person. I use the paintbrush tool to draw a hat on the person. Maybe I don't like what I drew with the paintbrush so I want to erase it, or part of it. I switch to the eraser tool, but instead of only erasing the hat that I drew with the paintbrush it erases the top part of the head also, exposing the blank background. How do I erase just the hat drawn with the paintbrush and not the entire image?

(Hopefully there is a method that works whilst still working on a single layer. I am not experienced enough at the moment to work with layers.)

Any advice would be greatly appreciated.

This is probably a silly question but what is singular in single-window mode?  I used to think it meant literally one window but you can have dockable dialogs as separate windows in both single-window mode and multi-window mode.

Hitherto I have used multi-window mode mainly for two reasons:

1. I put in long layer names to document what I did and often have many layers so having the layers dialog as a separate window allows me to easily adjust it's size.

2. I often like to see more than one image side by side, or a new view of an image along side the original.

This was all fine in gimp 2.10.

In gimp 3 I'm finding window management in multi-window mode OK when one image is open but pretty unusable when more than one is open.

So I'm thinking I could use single-window mode but with dockable dialogs as separate windows, e.g.  the layer dialog on it's own and several others docked together also in a separate window.  Point 1. would still be OK but not point 2.  I'm guessing you can't see more than one image at a time in single-window mode, not even a new view, is that what the single refers to?

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