We now need to add a new
layer to the document, on this layer we will add
the main cracked effect. Select the 'Polygonal Lasso'
tool
from the tools menu, now click and draw a jagged
shape.
Select black from the swatches tab or press 'd'
this will give the foreground the default fill colour
which is black. Then (at the top) go to 'edit' then
'fill'. You should now have a jagged black shape
similar to the one below.
note The shape above
the screw head does n't really matter as we will
be moving it below the head, so it wont be seen.
Now we have to move the
new cracked layer, below the screw head layer.
Click on the 'cracked layer' (layer 2) with the
mouse button and drag it below, so its in between
the screw layer and the background as shown in the
image on the left.
It now should look something similar to the image
shown below.
Now
we have the basic brush designed we can now create
a brush from it.