Step 1
Open any picture on which you want to add a fog.
Step 2
Create a new layer and name it fog.
Step 3
Take the Brush Tool (B), set its size to 50px, under Mode choose Dissolve and set Opacity to 50%. See the picture below.
Under Foreground color choose some grey tone, try to get fog color :), and start paint the part of picture which you want to be fog.
Step 4
Select the fog layer and click on Filter > Blur > Gaussian Blur. Then in Gaussian Blur panel under Radius set 20px. See the picture below.
Your picture now looks like this:
Step 5
Select the fog layer again, and click on "Add layer mask" icon in layers palette. Look at the picture below!
Step 6
Take the Gradient Tool (G), and in Gradient Editor set Black and White color.
Step 7
Drag the Gradient Tool from top - to the picture, to create a gradient to the sky and remove the fog on the top.
Finally, our work looks like this:
We're done!
Have a nice day!
