How to reduce the red color on image ?

[Stephen Liu]

       

(07-20-2022, 07:32 AM)david Wrote: The image at the start of this thread has dimensions of 734 pixels high and 563 pixels wide.
In GIMP duplicate the original layer.
With this layer active go to Filters/Blur/Pixelise and set Block width and Block height to 734 pixels (the maximum dimension of the image) - this converts the image to a single large pixel of the average colour of the picture.



Then use Colours/Invert to change the layer to its complementary colour and change its mode to overlay.



You have three alternative methods of achieving your required result. Please read carefully the posts by Pixlab, denzjos and myself and perhaps write yourself notes of the steps in each case to make sure you understand what you will be doing.

Thanks for your advice.

I suspect whether there is something wrong on my GIMP 2.10.32 here.  Following the steps advised by folks previously here I couldn't produce same result.

Performed following steps as advised by you;
Filters -> Blur -> Pixelize

pls refer to attached screenshot_pixelize_1.png

then -> OK

Colors -> Invert

Pls refer to screenshot_invert.png

I couldn't find the file "photo-sample.jpg copy"

Regards

---

(07-20-2022, 08:23 AM)denzjos Wrote: @Stephen Liu, G'Mic-Qt only solution for this kind of problem. All kind of problems, all kind of solutions.?

---

A other solution is by using this plugin : https://sourceforge.net/projects/johnlakgimp/

After install, find it in the gimp menu : Colors / Color Grading 

Thanks for your advice.

I have the plugin "color_grading_v174.tar.xz" download on Ubuntu 20.40 desktop

Whether performing following steps the plugin will be automatically added to my GIMP 2.10.32 ?

On Ubuntu Terminal run;

Code:

$ tar -xf color_grading_v174.tar.xz
$ cd color_grading_v174
$ ./configure
$ make
$ sudo make install

Pls advise.  Thanks

Regards