I'm completely new to graphic work! I am looking to achieve the same grey shade effect on these images using GIMP.
I believe it's just called an overlay.
You can achieve this effect by placing a black layer over top of your photo and changing the opacity until you get the level of dark you'd like. Works well with other colours than black too.
Changing the blending mode on the layer can add to it as well.
Looking at your pictures, it see that the desaturation mostly happens on the light tones, so try something like this:
- Duplicate the layer
Layer>Mask>Add layer maskand initialize to
Grayscale copy of layer
- On the Mask, use Brightness/Contrast to increase both lightness (a bit) and contrast (some more)
- On the Layer, use Levels to reduce the output level of the whites.
Your layer stack will look like this:
And the result is: