This tutorial will show you how to remove the background from an
image and replace it with something else
Step 1 - Extract the foreground.
Paste the image above into a new doccument (500px
by 466px) with a transparent background.
With the new layer selected go to filters > extract.
This is a very useful tool introduced in photoshop 6 to speed the
process of separating background and foreground. It will bring up
a dialogue box with the following options:
Select a fairly small brush size <15px
wide and select smart highlighting. Now trace the edge of the buildings
carefully. try to ensure that the smart highlighting is appearing
on the boundary between background and foreground.
When you reach an area with more complex
boundaries, such as the trees on the right,turn off smart highlighting
and use a larger bruh to paint over the whole area. The computer
will attempt to work out which bits need to be kept.
After tracing the whole outline, use
the fill tool (still in the extract dialogue) to colour the foreground
blue, you'll end up with something similar to this:
Click ok to perform the extraction.
Step 2 - Replace the background.
To do this simply create a new layer
behind the building layer. Into this insert whatever you want the
background to be. in this instance i used a rather cheerful mashed
But use whatever you wish to.
Step 3 - The history brush
You can use the history brush to
return any section of an image to the way it looked at any point
which uis visible in your history palette. To do this, open the
history palette then click the square next to the stage you wish
to revert to:
Then paint over the sections you wish
to revert using the history brush (y) not to be confused with the
art history brush. This will allow you to return any details which
were lost when using the extract funtion.