You've seen those web pages with that neat scan line
effect. Here is a quick way to apply this effect to an image.
It also works great if applied to a single color background.
1) Open the image you want to affect. Note the width
in pixels.
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Before
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After
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2) Now create a new image one pixel in height and
use the width of the first image.
3) Fill the one-pixel high image with black.
4) Now go - Image - Canvas Size. Change height from
1-pixel to 2-pixels. Click the top middle button to add the one
pixel vertically. You now have your two tone (black/line) scan
lines.
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Double the height
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5) Now go - Select - All. Click - Edit - Define Pattern.
This turns the image into a pattern fill.
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Fill the original image using - Pattern
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6) To add the scan line effect create a new layer
above the original image. Go - Layer - New - Layer…
7) Now go - Edit - Fill - Use - Pattern. You now
have black and white lines covering the image. There are two
ways to create the scan lines.
a) Reduce the 'opacity' slider to around 20%.
b) Select 'overlay' in the layers palette.
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Overlay creates a nice scan line effect
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