Changing color pict in grey excepted one color

[Gypsie38]

An example, 
a color picture in the street with cars. I want to change this picture in grey excepted keeping the color of one car
Thnaks

[rich2005]

(08-16-2024, 01:20 PM)Gypsie38 Wrote: An example, 
a color picture in the street with cars. I want to change this picture in grey excepted keeping the color of one car
Thnaks

If you look at this example https://www.gimp.org/tutorials/Layer_Mas...on-example It shows how you might do it using a layer mask.

[denzjos]

If you just want to view one colour, then you can use Tintii (also as plugin in gimp) https://indii.org/software/tintii/
   

[rich2005]

@Gypsie38

It would really help if you gave more information of:
Your operating system, currently shown as IOS
Version of Gimp.

otherwise some suggestions are unlikely to work.

[Ofnuts]

(08-16-2024, 01:20 PM)Gypsie38 Wrote: An example, 
a color picture in the street with cars. I want to change this picture in grey excepted keeping the color of one car
Thnaks

This is an effect known as "partial or selective desaturation". Typically you duplicate the picture, change everything to grey in the top layer (Colors > Desaturate > Desaturate) then use the Erase (or better, a layer mask) to erase the grey car at the top so that the color car from the bottom layer shows through.

An example here: https://www.gimp-forum.net/Thread-Partia...with-a-car

But you will find many tutorials on the technique, once you know what to look for.

[Gypsie38]

denzjos Wrote:If you just want to view one colour, then you can use Tintii (also as plugin in gimp) https://indii.org/software/tintii/

I thank you. I did use it many years ago but stopped it because I had a message that my trying period was over.

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Thank you to everyone. But, for me, it seems complex!. Anyway, I'll try, following this tuto

[rich2005]

(08-17-2024, 09:22 AM)Gypsie38 Wrote:

denzjos Wrote:If you just want to view one colour, then you can use Tintii (also as plugin in gimp) https://indii.org/software/tintii/

I thank you. I did use it many years ago but stopped it because I had a message that my trying period was over.

From memory, the tintii photoshop plugin was pay-for with a trial period. This software is long gone except if you use linux, still there in the ubuntu repo. You might find something using the internet archive. Edit: https://web.archive.org/web/201405181928...i/download Free trial Win / Mac

Quote:Thank you to everyone. But, for me, it seems complex!. Anyway, I'll try, following this tuto

I still prefer using a layer mask to the eraser method, make a mistake switch from black FG to white FG color and paint out.

Here is a 40 second example. https://i.imgur.com/gx8o3nO.mp4

[PixLab]

(08-17-2024, 10:09 AM)rich2005 Wrote: From memory, the tintii photoshop plugin was pay-for with a trial period. This software is long gone except if you use linux, still there in the ubuntu repo.

Wowww, I wanted to see this "tintii", thus doing a "sudo apt install tintii" and got the famous "tintii is already the newest version (2.10.0-2build1)."...
So I have it installed on my distro for so many years and completely forget about it, I don't recall that name  

Looks cool, though, was this software a paid for photoshop only? because it 's free on Linux...
In all case thank you rich2005 for the wake up