This tutorial will tell you how
to make lines on a picture to generate an effect
similar to that of scanlines on a TV.
1. Make a new image 1 pixel
wide and 2 pixels high with a transparent
background.(If you want vertical lines, make the
dimensions 2 wide and 1 high. Also, if you want
the lines further apart, make the longest side
longer: 2>3>4 etc.)
2. Zoom up to 1600% and use the
pencil tool to make one pixel black. Leave the
other one clear.
3. Press Ctrl-A to Select All.
Then go to Edit>Define Pattern.
4. Open the image you want to
put the lines on and add a new layer. This will
allow you to adjust the lines after you have made
5. Select the area you want to
interlace, and go to Edit>Fill. In the
'Contents' Drop-down box, choose 'Pattern' with
100% opacity. Click OK.
You now have lines on your
picture. If you want to make them lighter just
adjust the opacity of that layer. Since you have
them on a layer, you can do anything you want to
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