Scan Lines
This creates the horizontal scan lines often used
for different photo effects. First we need to create a image to be
used as a pattern. Create a new image 4x4 pixels:
Zoom in considerably and then fill the top half of
the 4x4 image black. Either use the line tool or the fill tool (but
first draw a selection). The end result should look something like
(naturally this is enlarged quite a bit):
Now to define a filter select the image with Ctrl+A
(or Select -> All) and then click on the Edit menu and select
Define Pattern.
Open the image you want to apply the effect to, in
this case we're using this picture:
Create a new layer:
Select the Edit menu and then Fill. Set the fill
properties to as shown. Adjust the opacity and mode to achieve
different results. You don't have to have the effect on a separate
layer (step 4) but doing so lets you easily adjust the opacity and
original image.
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